From a3df5c4d99c0a774406593bbd6c5a7772c275480 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Mon, 2 Sep 2024 13:42:10 +0800
Subject: [PATCH 1/6] Bump friendsofphp/php-cs-fixer from 3.62.0 to 3.64.0
 (#4178)

Bumps [friendsofphp/php-cs-fixer](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer) from 3.62.0 to 3.64.0.
- [Release notes](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/releases)
- [Changelog](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/compare/v3.62.0...v3.64.0)

---
updated-dependencies:
- dependency-name: friendsofphp/php-cs-fixer
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
---
 composer.lock | 60 +++++++++++++++++++++++++--------------------------
 1 file changed, 30 insertions(+), 30 deletions(-)

diff --git a/composer.lock b/composer.lock
index 7afc631ede6c..4be079586ceb 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1112,16 +1112,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v5.4.42",
+            "version": "v5.4.43",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "cef62396a0477e94fc52e87a17c6e5c32e226b7f"
+                "reference": "e86f8554de667c16dde8aeb89a3990cfde924df9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/cef62396a0477e94fc52e87a17c6e5c32e226b7f",
-                "reference": "cef62396a0477e94fc52e87a17c6e5c32e226b7f",
+                "url": "https://api.github.com/repos/symfony/console/zipball/e86f8554de667c16dde8aeb89a3990cfde924df9",
+                "reference": "e86f8554de667c16dde8aeb89a3990cfde924df9",
                 "shasum": ""
             },
             "require": {
@@ -1191,7 +1191,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v5.4.42"
+                "source": "https://github.com/symfony/console/tree/v5.4.43"
             },
             "funding": [
                 {
@@ -1207,7 +1207,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-26T12:21:55+00:00"
+            "time": "2024-08-13T16:31:56+00:00"
         },
         {
             "name": "symfony/css-selector",
@@ -2130,16 +2130,16 @@
         },
         {
             "name": "symfony/string",
-            "version": "v5.4.42",
+            "version": "v5.4.43",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "909cec913edea162a3b2836788228ad45fcab337"
+                "reference": "8be1d484951ff5ca995eaf8edcbcb8b9a5888450"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/909cec913edea162a3b2836788228ad45fcab337",
-                "reference": "909cec913edea162a3b2836788228ad45fcab337",
+                "url": "https://api.github.com/repos/symfony/string/zipball/8be1d484951ff5ca995eaf8edcbcb8b9a5888450",
+                "reference": "8be1d484951ff5ca995eaf8edcbcb8b9a5888450",
                 "shasum": ""
             },
             "require": {
@@ -2196,7 +2196,7 @@
                 "utf8"
             ],
             "support": {
-                "source": "https://github.com/symfony/string/tree/v5.4.42"
+                "source": "https://github.com/symfony/string/tree/v5.4.43"
             },
             "funding": [
                 {
@@ -2212,7 +2212,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-20T18:38:32+00:00"
+            "time": "2024-08-01T10:24:28+00:00"
         }
     ],
     "packages-dev": [
@@ -2695,16 +2695,16 @@
         },
         {
             "name": "fidry/cpu-core-counter",
-            "version": "1.1.0",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theofidry/cpu-core-counter.git",
-                "reference": "f92996c4d5c1a696a6a970e20f7c4216200fcc42"
+                "reference": "8520451a140d3f46ac33042715115e290cf5785f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theofidry/cpu-core-counter/zipball/f92996c4d5c1a696a6a970e20f7c4216200fcc42",
-                "reference": "f92996c4d5c1a696a6a970e20f7c4216200fcc42",
+                "url": "https://api.github.com/repos/theofidry/cpu-core-counter/zipball/8520451a140d3f46ac33042715115e290cf5785f",
+                "reference": "8520451a140d3f46ac33042715115e290cf5785f",
                 "shasum": ""
             },
             "require": {
@@ -2744,7 +2744,7 @@
             ],
             "support": {
                 "issues": "https://github.com/theofidry/cpu-core-counter/issues",
-                "source": "https://github.com/theofidry/cpu-core-counter/tree/1.1.0"
+                "source": "https://github.com/theofidry/cpu-core-counter/tree/1.2.0"
             },
             "funding": [
                 {
@@ -2752,20 +2752,20 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-02-07T09:43:46+00:00"
+            "time": "2024-08-06T10:04:20+00:00"
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v3.62.0",
+            "version": "v3.64.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer.git",
-                "reference": "627692f794d35c43483f34b01d94740df2a73507"
+                "reference": "58dd9c931c785a79739310aef5178928305ffa67"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/627692f794d35c43483f34b01d94740df2a73507",
-                "reference": "627692f794d35c43483f34b01d94740df2a73507",
+                "url": "https://api.github.com/repos/PHP-CS-Fixer/PHP-CS-Fixer/zipball/58dd9c931c785a79739310aef5178928305ffa67",
+                "reference": "58dd9c931c785a79739310aef5178928305ffa67",
                 "shasum": ""
             },
             "require": {
@@ -2847,7 +2847,7 @@
             ],
             "support": {
                 "issues": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/issues",
-                "source": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/tree/v3.62.0"
+                "source": "https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/tree/v3.64.0"
             },
             "funding": [
                 {
@@ -2855,7 +2855,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-08-07T17:03:09+00:00"
+            "time": "2024-08-30T23:09:38+00:00"
         },
         {
             "name": "macopedia/phpstan-magento1",
@@ -6038,16 +6038,16 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v5.4.42",
+            "version": "v5.4.43",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "0724c51fa067b198e36506d2864e09a52180998a"
+                "reference": "ae25a9145a900764158d439653d5630191155ca0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/0724c51fa067b198e36506d2864e09a52180998a",
-                "reference": "0724c51fa067b198e36506d2864e09a52180998a",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/ae25a9145a900764158d439653d5630191155ca0",
+                "reference": "ae25a9145a900764158d439653d5630191155ca0",
                 "shasum": ""
             },
             "require": {
@@ -6081,7 +6081,7 @@
             "description": "Finds files and directories via an intuitive fluent interface",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v5.4.42"
+                "source": "https://github.com/symfony/finder/tree/v5.4.43"
             },
             "funding": [
                 {
@@ -6097,7 +6097,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-22T08:53:29+00:00"
+            "time": "2024-08-13T14:03:51+00:00"
         },
         {
             "name": "symfony/options-resolver",

From 33adc745c360388f499787dfcd4d4a2b3bcf30e1 Mon Sep 17 00:00:00 2001
From: Sven Reichel <github-sr@hotmail.com>
Date: Mon, 2 Sep 2024 07:46:22 +0200
Subject: [PATCH 2/6] PHP-CS-Fixer: added check for double quotes (#4126)

* Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)

* Rector: CQ - UnusedForeachValueToArrayKeysRector

See Rector\CodeQuality\Rector\Foreach_\UnusedForeachValueToArrayKeysRector

* fixes + phpstan

See fix at rector: https://github.com/rectorphp/rector-src/pull/6164

* Revert "Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)"

This reverts commit 3d7eaf63f2211a9e1a8defe8c29e8f6da889ab2e.

* Convert double-quotes to single-quotes
---
 .github/workflows/labeler.yml                 |   2 +
 .php-cs-fixer.dist.php                        |   2 +
 app/code/core/Mage/Admin/Model/Config.php     |   6 +-
 app/code/core/Mage/Admin/Model/Observer.php   |   2 +-
 .../core/Mage/Admin/Model/Resource/Acl.php    |   2 +-
 .../Admin/Model/Resource/Roles/Collection.php |   2 +-
 .../Model/Resource/Roles/User/Collection.php  |   2 +-
 app/code/core/Mage/Admin/Model/Roles.php      |   4 +-
 .../admin_setup/upgrade-1.6.1.1-1.6.1.2.php   |   4 +-
 .../Mage/Adminhtml/Block/Api/Editroles.php    |   2 +-
 .../Mage/Adminhtml/Block/Api/Grid/Role.php    |   2 +-
 .../Adminhtml/Block/Api/Role/Grid/User.php    |   2 +-
 .../Adminhtml/Block/Api/Tab/Rolesusers.php    |   2 +-
 .../Adminhtml/Block/Api/Tab/Userroles.php     |   4 +-
 .../Block/Api/User/Edit/Tab/Roles.php         |   2 +-
 .../Block/Catalog/Category/Abstract.php       |   2 +-
 .../Catalog/Category/Helper/Pricestep.php     |   2 +-
 .../Category/Helper/Sortby/Available.php      |   2 +-
 .../Category/Helper/Sortby/Default.php        |   2 +-
 .../Adminhtml/Block/Catalog/Category/Tree.php |   4 +-
 .../Product/Attribute/Edit/Tab/Main.php       |  10 +-
 .../Catalog/Product/Helper/Form/Gallery.php   |   6 +-
 .../Mage/Adminhtml/Block/Checkout/Formkey.php |   2 +-
 .../Mage/Adminhtml/Block/Dashboard/Graph.php  |  20 +-
 .../Block/Newsletter/Queue/Preview.php        |   6 +-
 .../Block/Newsletter/Template/Preview.php     |   6 +-
 .../Adminhtml/Block/Notification/Curl.php     |   2 +-
 .../Adminhtml/Block/Permissions/Grid/Role.php |   2 +-
 .../Adminhtml/Block/Permissions/Grid/User.php |   2 +-
 .../Block/Permissions/Role/Grid/User.php      |   2 +-
 .../Block/Permissions/Tab/Rolesusers.php      |   2 +-
 .../Block/Permissions/Tab/Userroles.php       |   4 +-
 .../Block/Permissions/User/Edit/Tab/Roles.php |   2 +-
 .../Block/Permissions/Usernroles.php          |   4 +-
 .../core/Mage/Adminhtml/Block/Rating/Edit.php |   2 +-
 .../Report/Grid/Column/Renderer/Currency.php  |   2 +-
 .../Adminhtml/Block/Sales/Order/Create.php    |   2 +-
 .../Block/Sales/Order/Create/Items/Grid.php   |   2 +-
 .../Block/Sales/Order/View/Tab/History.php    |   2 +-
 .../Block/Sales/Transactions/Detail.php       |   2 +-
 .../Block/System/Config/Form/Field/Export.php |   2 +-
 .../Adminhtml/Block/System/Config/Tabs.php    |   2 +-
 .../System/Convert/Gui/Edit/Tab/Wizard.php    |   4 +-
 .../Block/System/Convert/Profile/Run.php      |   8 +-
 .../Block/System/Email/Template/Preview.php   |   6 +-
 .../Block/System/Store/Delete/Group.php       |   2 +-
 .../Block/System/Store/Delete/Website.php     |   2 +-
 .../Mage/Adminhtml/Block/Tax/Rule/Edit.php    |   2 +-
 .../Block/Widget/Form/Element/Gallery.php     |   2 +-
 .../core/Mage/Adminhtml/Block/Widget/Grid.php |   4 +-
 .../Widget/Grid/Column/Renderer/Checkbox.php  |   2 +-
 .../Widget/Grid/Column/Renderer/Currency.php  |   2 +-
 .../Widget/Grid/Column/Renderer/Price.php     |   2 +-
 .../Widget/Grid/Column/Renderer/Wrapline.php  |   2 +-
 .../Block/Widget/Grid/Massaction/Abstract.php |   4 +-
 .../core/Mage/Adminhtml/Controller/Action.php |   4 +-
 .../Model/Customer/Renderer/Region.php        |   4 +-
 .../System/Config/Source/Tax/Basedon.php      |   2 +-
 .../System/Config/Source/Tax/Catalog.php      |   2 +-
 .../controllers/Api/RoleController.php        |  12 +-
 .../Adminhtml/controllers/CacheController.php |  10 +-
 .../Catalog/CategoryController.php            |   4 +-
 .../Catalog/Product/GalleryController.php     |   4 +-
 .../controllers/Catalog/ProductController.php |   4 +-
 .../controllers/Cms/BlockController.php       |   2 +-
 .../controllers/Cms/PageController.php        |   2 +-
 .../Adminhtml/controllers/IndexController.php |   2 +-
 .../controllers/RatingController.php          |   2 +-
 .../Sales/Billing/AgreementController.php     |   2 +-
 .../Sales/Order/CreditmemoController.php      |   6 +-
 .../Sales/Order/InvoiceController.php         |   2 +-
 .../Sales/Order/ShipmentController.php        |   2 +-
 .../controllers/Sales/OrderController.php     |   2 +-
 .../Sales/TransactionsController.php          |   2 +-
 .../controllers/System/AccountController.php  |   6 +-
 .../System/Convert/GuiController.php          |   2 +-
 .../controllers/System/DesignController.php   |   2 +-
 .../controllers/System/StoreController.php    |  10 +-
 .../Tax/Class/CustomerController.php          |   2 +-
 .../Tax/Class/ProductController.php           |   2 +-
 .../controllers/Tax/RateController.php        |  10 +-
 .../controllers/Tax/RuleController.php        |   4 +-
 .../Model/Resource/Roles/User/Collection.php  |   2 +-
 .../Api/Model/Resource/Rules/Collection.php   |   2 +-
 app/code/core/Mage/Api/Model/Roles.php        |   2 +-
 app/code/core/Mage/Api/Model/Server.php       |   2 +-
 .../Mage/Api/Model/Server/Adapter/Soap.php    |   6 +-
 .../Mage/Api/Model/Server/Adapter/Xmlrpc.php  |   2 +-
 .../Mage/Api/Model/Server/V2/Adapter/Soap.php |   2 +-
 .../Api/Model/Server/Wsi/Adapter/Soap.php     |   2 +-
 app/code/core/Mage/Api/Model/Wsdl/Config.php  |   8 +-
 .../Api2/Model/Resource/Validator/Eav.php     |   2 +-
 app/code/core/Mage/Api2/Model/Server.php      |   4 +-
 .../Adminhtml/Api2/RoleController.php         |   6 +-
 .../core/Mage/Authorizenet/Helper/Admin.php   |   2 +-
 .../core/Mage/Authorizenet/Helper/Data.php    |   2 +-
 .../Authorizenet/Model/Directpost/Request.php |   2 +-
 .../Product/Edit/Tab/Attributes/Extend.php    |  12 +-
 .../Adminhtml/Sales/Order/Items/Renderer.php  |   2 +-
 .../Sales/Order/View/Items/Renderer.php       |   2 +-
 .../Block/Sales/Order/Items/Renderer.php      |   2 +-
 .../Mage/Bundle/Model/Resource/Bundle.php     |  12 +-
 .../Bundle/Model/Resource/Indexer/Price.php   |   8 +-
 .../Mage/Bundle/Model/Resource/Selection.php  |   2 +-
 .../Model/Sales/Order/Pdf/Items/Abstract.php  |   2 +-
 .../mysql4-data-upgrade-0.1.13-0.1.14.php     |   4 +-
 .../core/Mage/Catalog/Block/Widget/Link.php   |   6 +-
 .../Catalog/Helper/Category/Url/Rewrite.php   |   4 +-
 app/code/core/Mage/Catalog/Helper/Data.php    |   2 +-
 app/code/core/Mage/Catalog/Helper/Product.php |   2 +-
 .../core/Mage/Catalog/Model/Category/Api.php  |   4 +-
 .../Category/Attribute/Backend/Sortby.php     |   2 +-
 .../Catalog/Model/Convert/Adapter/Product.php |   2 +-
 app/code/core/Mage/Catalog/Model/Design.php   |   2 +-
 app/code/core/Mage/Catalog/Model/Product.php  |   2 +-
 .../Model/Product/Attribute/Backend/Media.php |  16 +-
 .../core/Mage/Catalog/Model/Product/Image.php |   4 +-
 .../Model/Product/Option/Type/File.php        |   6 +-
 .../Catalog/Model/Product/Type/Abstract.php   |   2 +-
 .../Mage/Catalog/Model/Resource/Category.php  |   6 +-
 .../Catalog/Model/Resource/Category/Flat.php  |   6 +-
 .../Resource/Category/Indexer/Product.php     |  16 +-
 .../Model/Resource/Collection/Abstract.php    |   2 +-
 .../Model/Resource/Layer/Filter/Decimal.php   |   2 +-
 .../Model/Resource/Product/Collection.php     |   2 +-
 .../Model/Resource/Product/Flat/Indexer.php   |   2 +-
 .../Product/Indexer/Price/Configurable.php    |   4 +-
 .../Product/Indexer/Price/Default.php         |  14 +-
 .../data-upgrade-1.6.0.0.4-1.6.0.0.5.php      |   4 +-
 .../mysql4-upgrade-0.7.13-0.7.14.php          |   2 +-
 .../mysql4-upgrade-0.7.46-0.7.47.php          |   4 +-
 .../mysql4-upgrade-0.7.51-0.7.52.php          |   2 +-
 .../core/Mage/CatalogIndex/Model/Indexer.php  |   4 +-
 .../Model/Resource/Aggregation.php            |   2 +-
 .../Model/Resource/Data/Abstract.php          |   8 +-
 .../CatalogIndex/Model/Resource/Indexer.php   |  10 +-
 .../CatalogIndex/Model/Resource/Price.php     |   6 +-
 .../Model/Action/Index/Refresh.php            |   4 +-
 .../mysql4-upgrade-0.7.1-0.7.2.php            |   6 +-
 .../CatalogSearch/Block/Advanced/Form.php     |   2 +-
 .../CatalogSearch/Model/Resource/Fulltext.php |   2 +-
 .../Model/Resource/Helper/Mysql4.php          |   6 +-
 .../core/Mage/Centinel/Model/Api/Client.php   |   4 +-
 .../core/Mage/Checkout/Model/Api/Resource.php |   2 +-
 .../Checkout/Model/Api/Resource/Product.php   |   2 +-
 .../core/Mage/Checkout/Model/Cart/Api.php     |  10 +-
 .../Mage/Checkout/Model/Cart/Coupon/Api.php   |   2 +-
 .../Mage/Checkout/Model/Cart/Customer/Api.php |   4 +-
 .../Mage/Checkout/Model/Cart/Payment/Api.php  |   4 +-
 .../Mage/Checkout/Model/Cart/Product/Api.php  |  44 ++---
 .../Mage/Checkout/Model/Cart/Shipping/Api.php |   6 +-
 .../controllers/OnepageController.php         |   2 +-
 .../data/cms_setup/data-install-1.6.0.0.php   | 144 +++++++--------
 .../data-upgrade-1.6.0.0.0-1.6.0.0.1.php      |   2 +-
 .../data-upgrade-1.6.0.0.1-1.6.0.0.2.php      |   8 +-
 .../Helper/Productimg.php                     |   4 +-
 app/code/core/Mage/Core/Helper/Data.php       |   2 +-
 app/code/core/Mage/Core/Helper/Http.php       |   4 +-
 app/code/core/Mage/Core/Helper/Js.php         |   2 +-
 app/code/core/Mage/Core/Helper/String.php     |   2 +-
 app/code/core/Mage/Core/Helper/Translate.php  |   2 +-
 app/code/core/Mage/Core/Model/App.php         |   2 +-
 app/code/core/Mage/Core/Model/Config.php      |   2 +-
 app/code/core/Mage/Core/Model/Email/Queue.php |   2 +-
 .../core/Mage/Core/Model/Email/Template.php   |   2 +-
 .../Core/Model/Email/Template/Abstract.php    |  14 +-
 .../core/Mage/Core/Model/File/Uploader.php    |   2 +-
 .../Mage/Core/Model/File/Validator/Image.php  |   2 +-
 .../core/Mage/Core/Model/Input/Filter.php     |   2 +-
 app/code/core/Mage/Core/Model/Layout.php      |   2 +-
 .../core/Mage/Core/Model/Layout/Validator.php |   4 +-
 app/code/core/Mage/Core/Model/Locale.php      |   2 +-
 .../Model/Resource/Url/Rewrite/Collection.php |   2 +-
 app/code/core/Mage/Core/Model/Url.php         |   2 +-
 app/code/core/Mage/Core/functions.php         |  34 ++--
 .../mysql4-upgrade-0.8.14-0.8.15.php          |   2 +-
 .../mysql4-upgrade-0.8.15-0.8.16.php          |   2 +-
 .../mysql4-upgrade-0.8.16-0.8.17.php          |   2 +-
 app/code/core/Mage/Cron/Model/Schedule.php    |   4 +-
 .../Block/Account/Dashboard/Sidebar.php       |   2 +-
 .../Model/Convert/Adapter/Customer.php        |   2 +-
 .../Model/Convert/Parser/Customer.php         |  10 +-
 .../Model/Resource/Group/Collection.php       |   2 +-
 .../controllers/AccountController.php         |   6 +-
 .../Model/Convert/Container/Abstract.php      |   8 +-
 .../Dataflow/Model/Convert/Parser/Csv.php     |   4 +-
 .../Model/Convert/Profile/Abstract.php        |   2 +-
 .../Model/Convert/Validator/Dryrun.php        |   2 +-
 .../Mage/Dataflow/Model/Mysql4/Catalogold.php |   4 +-
 app/code/core/Mage/Dataflow/Model/Profile.php |   8 +-
 .../core/Mage/Directory/Model/Country.php     |   8 +-
 .../core/Mage/Directory/Model/Currency.php    |   2 +-
 .../Mage/Directory/Model/Currency/Filter.php  |   2 +-
 .../Model/Resource/Country/Collection.php     |   6 +-
 .../Model/Resource/Currency/Collection.php    |   4 +-
 .../Model/Resource/Region/Collection.php      |   2 +-
 .../Model/Resource/Indexer/Price.php          |   2 +-
 .../Adminhtml/Downloadable/FileController.php |   4 +-
 .../controllers/DownloadController.php        |   4 +-
 .../Eav/Model/Attribute/Data/Multiline.php    |   4 +-
 app/code/core/Mage/Eav/Model/Config.php       |   2 +-
 .../Mage/Eav/Model/Convert/Adapter/Entity.php |   4 +-
 .../Eav/Model/Entity/Attribute/Abstract.php   |   2 +-
 .../Entity/Attribute/Backend/Abstract.php     |   2 +-
 .../Eav/Model/Resource/Entity/Attribute.php   |  14 +-
 .../Model/Resource/Entity/Attribute/Group.php |   2 +-
 .../Resource/Entity/Attribute/Option.php      |  10 +-
 .../mysql4-upgrade-0.7.10-0.7.11.php          |   2 +-
 .../eav_setup/mysql4-upgrade-0.7.7-0.7.8.php  |   2 +-
 .../eav_setup/mysql4-upgrade-0.7.9-0.7.10.php |   2 +-
 app/code/core/Mage/GiftMessage/Model/Api.php  |  10 +-
 .../core/Mage/GoogleAnalytics/Block/Ga.php    |   6 +-
 .../core/Mage/GoogleAnalytics/Helper/Data.php |   2 +-
 .../ImportExport/Model/Export/Adapter/Csv.php |   2 +-
 .../core/Mage/ImportExport/Model/Import.php   |   2 +-
 .../Model/Import/Adapter/Abstract.php         |   2 +-
 .../Model/Import/Entity/Abstract.php          |   4 +-
 .../Index/Model/Resource/Helper/Mysql4.php    |   6 +-
 app/code/core/Mage/Install/Model/Observer.php |   4 +-
 app/code/core/Mage/Log/Model/Aggregation.php  |   2 +-
 .../Model/Resource/Problem/Collection.php     |   2 +-
 .../Model/Resource/Subscriber/Collection.php  |   4 +-
 .../mysql4-upgrade-0.8.1-0.8.2.php            |   2 +-
 .../mysql4-upgrade-0.8.2-0.8.3.php            |  12 +-
 .../Block/Adminhtml/Oauth/Consumer/Edit.php   |   2 +-
 app/code/core/Mage/Page/Block/Html/Head.php   |  10 +-
 app/code/core/Mage/Payment/Block/Form/Cc.php  |   2 +-
 app/code/core/Mage/Payment/Model/Config.php   |   2 +-
 app/code/core/Mage/Paypal/Model/Config.php    |   8 +-
 app/code/core/Mage/Paypal/Model/Hostedpro.php |   4 +-
 .../Mage/Paypal/Model/Payflow/Request.php     |   2 +-
 .../Mage/Paypal/Model/Report/Settlement.php   |  10 +-
 .../Payment/Transaction/Collection.php        |   2 +-
 .../System/Config/Source/FetchingSchedule.php |  14 +-
 .../Mage/Rating/Model/Resource/Rating.php     |   2 +-
 .../Rating/Option/Vote/Collection.php         |   4 +-
 app/code/core/Mage/Reports/Helper/Data.php    |   4 +-
 .../Model/Resource/Customer/Collection.php    |  12 +-
 .../Entity/Summary/Collection/Abstract.php    |   8 +-
 .../Model/Resource/Invoiced/Collection.php    |   2 +-
 .../Model/Resource/Order/Collection.php       |   2 +-
 .../Model/Resource/Product/Collection.php     |   8 +-
 .../Model/Resource/Quote/Collection.php       |   4 +-
 .../Model/Resource/Report/Abstract.php        |   4 +-
 .../Model/Resource/Review/Collection.php      |   2 +-
 .../Resource/Review/Product/Collection.php    |   2 +-
 .../Resource/Tag/Customer/Collection.php      |   2 +-
 .../Reports/Model/Resource/Tax/Collection.php |   2 +-
 .../Resource/Wishlist/Product/Collection.php  |   2 +-
 app/code/core/Mage/Reports/Model/Test.php     |  12 +-
 app/code/core/Mage/Reports/Model/Totals.php   |   2 +-
 .../Mage/Review/Model/Resource/Review.php     |   6 +-
 .../core/Mage/Rule/Model/Action/Abstract.php  |  10 +-
 .../Mage/Rule/Model/Action/Collection.php     |   2 +-
 .../Mage/Rule/Model/Condition/Combine.php     |   8 +-
 .../Sales/Block/Order/Email/Items/Default.php |   2 +-
 .../Block/Order/Email/Items/Order/Default.php |   2 +-
 app/code/core/Mage/Sales/Model/Observer.php   |   2 +-
 app/code/core/Mage/Sales/Model/Order/Api.php  |  10 +-
 .../core/Mage/Sales/Model/Order/Config.php    |   2 +-
 .../Mage/Sales/Model/Order/Invoice/Item.php   |   4 +-
 .../Mage/Sales/Model/Order/Pdf/Abstract.php   |   6 +-
 .../Sales/Model/Order/Pdf/Items/Abstract.php  |   2 +-
 .../Mage/Sales/Model/Recurring/Profile.php    |   2 +-
 .../core/Mage/Sales/Model/Resource/Order.php  |   2 +-
 .../Model/Resource/Order/Item/Collection.php  |   2 +-
 .../mysql4-upgrade-0.8.13-0.8.14.php          |   2 +-
 .../mysql4-upgrade-0.9.46-0.9.47.php          |   2 +-
 .../Model/Rule/Condition/Product/Found.php    |   2 +-
 .../Rule/Condition/Product/Subselect.php      |   2 +-
 .../mysql4-upgrade-0.7.4-0.7.5.php            |   2 +-
 .../Model/Resource/Carrier/Tablerate.php      |   4 +-
 .../Mage/Tag/Model/Resource/Tag/Relation.php  |   2 +-
 app/code/core/Mage/Tax/Helper/Data.php        |   2 +-
 .../Mage/Tax/Model/Resource/Calculation.php   |   6 +-
 .../tax_setup/mysql4-upgrade-0.7.4-0.7.5.php  |   2 +-
 .../tax_setup/mysql4-upgrade-0.7.7-0.7.8.php  |   2 +-
 .../tax_setup/mysql4-upgrade-0.7.9-0.7.10.php |   6 +-
 .../Mage/Uploader/Model/Config/Abstract.php   |   2 +-
 .../Mage/Usa/Model/Shipping/Carrier/Dhl.php   |   2 +-
 .../Shipping/Carrier/Dhl/International.php    |  16 +-
 .../Carrier/Dhl/Label/Pdf/PageBuilder.php     |  16 +-
 .../Mage/Usa/Model/Shipping/Carrier/Fedex.php |   4 +-
 .../Mage/Usa/Model/Shipping/Carrier/Ups.php   | 172 +++++++++---------
 .../Usa/Model/Shipping/Carrier/UpsAuth.php    |   4 +-
 .../Mage/Weee/Block/Renderer/Weee/Tax.php     |   2 +-
 .../weee_setup/mysql4-upgrade-0.11-0.12.php   |   2 +-
 .../sql/weee_setup/mysql4-upgrade-0.2-0.3.php |   2 +-
 app/code/core/Mage/Widget/Model/Widget.php    |   2 +-
 .../Wishlist/controllers/IndexController.php  |   2 +-
 lib/Mage/Archive/Helper/File.php              |   2 +-
 lib/Mage/Archive/Tar.php                      |  18 +-
 lib/Mage/DB/Mysqli.php                        |  30 +--
 lib/Mage/HTTP/Client.php                      |  12 +-
 lib/Mage/HTTP/Client/Curl.php                 |  16 +-
 lib/Mage/HTTP/Client/Socket.php               |  30 +--
 lib/Mage/System/Ftp.php                       |  44 ++---
 lib/Magento/Db/Sql/Trigger.php                |   6 +-
 lib/Varien/Cache/Backend/Memcached.php        |   2 +-
 lib/Varien/Cache/Core.php                     |   2 +-
 lib/Varien/Convert/Container/Abstract.php     |   6 +-
 lib/Varien/Convert/Parser/Xml/Excel.php       |   4 +-
 lib/Varien/Convert/Profile/Abstract.php       |   2 +-
 lib/Varien/Data/Collection/Db.php             |   2 +-
 lib/Varien/Data/Form/Element/Editor.php       |   4 +-
 lib/Varien/Data/Form/Element/Textarea.php     |   2 +-
 lib/Varien/Db/Adapter/Pdo/Mysql.php           |  72 ++++----
 lib/Varien/Debug.php                          |   4 +-
 lib/Varien/Directory/Collection.php           |   2 +-
 lib/Varien/Directory/Factory.php              |   4 +-
 lib/Varien/File/Object.php                    |   6 +-
 lib/Varien/File/Transfer/Adapter/Http.php     |   2 +-
 lib/Varien/File/Uploader/Image.php            |  18 +-
 lib/Varien/Filter/Template.php                |   4 +-
 lib/Varien/Image/Adapter/Gd2.php              |   8 +-
 lib/Varien/Io/Abstract.php                    |  10 +-
 lib/Varien/Io/File.php                        |   8 +-
 lib/Varien/Io/Sftp.php                        |   2 +-
 lib/Varien/Object.php                         |   4 +-
 lib/Varien/Profiler.php                       |  10 +-
 lib/Varien/Simplexml/Config.php               |   2 +-
 lib/Varien/Simplexml/Element.php              |   4 +-
 shell/indexer.php                             |   2 +-
 323 files changed, 937 insertions(+), 933 deletions(-)

diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index d0f7a2164121..ccf6efe4e530 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -8,6 +8,8 @@
 name: Labeler
 on:
   pull_request_target:
+  # Allow manually triggering the workflow.
+  workflow_dispatch:
 
 jobs:
   triage:
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index fb06ee5555f0..e5c4f7cfcde7 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -83,6 +83,8 @@
         'single_import_per_statement' => true,
         // Each namespace use MUST go on its own line and there MUST be one blank line after the use statements block.
         'single_line_after_imports' => true,
+        // Convert double quotes to single quotes for simple strings.
+        'single_quote' => true,
         // Each trait `use` must be done as single statement.
         'single_trait_insert_per_statement' => true,
         // A case should be followed by a colon and not a semicolon.
diff --git a/app/code/core/Mage/Admin/Model/Config.php b/app/code/core/Mage/Admin/Model/Config.php
index e2a4e17b0f7f..cb7aa5c38160 100644
--- a/app/code/core/Mage/Admin/Model/Config.php
+++ b/app/code/core/Mage/Admin/Model/Config.php
@@ -79,7 +79,7 @@ public function __construct()
     public function loadAclResources(Mage_Admin_Model_Acl $acl, $resource = null, $parentName = null)
     {
         if (is_null($resource)) {
-            $resource = $this->getAdminhtmlConfig()->getNode("acl/resources");
+            $resource = $this->getAdminhtmlConfig()->getNode('acl/resources');
             $resourceName = null;
         } else {
             $resourceName = (is_null($parentName) ? '' : $parentName . '/') . $resource->getName();
@@ -117,7 +117,7 @@ public function loadAclResources(Mage_Admin_Model_Acl $acl, $resource = null, $p
      */
     public function getAclAssert($name = '')
     {
-        $asserts = $this->getNode("admin/acl/asserts");
+        $asserts = $this->getNode('admin/acl/asserts');
         if ($name === '') {
             return $asserts;
         }
@@ -133,7 +133,7 @@ public function getAclAssert($name = '')
      */
     public function getAclPrivilegeSet($name = '')
     {
-        $sets = $this->getNode("admin/acl/privilegeSets");
+        $sets = $this->getNode('admin/acl/privilegeSets');
         if ($name === '') {
             return $sets;
         }
diff --git a/app/code/core/Mage/Admin/Model/Observer.php b/app/code/core/Mage/Admin/Model/Observer.php
index 918ba07c1e22..e945acc6c945 100644
--- a/app/code/core/Mage/Admin/Model/Observer.php
+++ b/app/code/core/Mage/Admin/Model/Observer.php
@@ -55,7 +55,7 @@ public function actionPreDispatchAdmin($observer)
                     /** @var Mage_Core_Model_Session $coreSession */
                     $coreSession = Mage::getSingleton('core/session');
 
-                    if ($coreSession->validateFormKey($request->getPost("form_key"))) {
+                    if ($coreSession->validateFormKey($request->getPost('form_key'))) {
                         $postLogin = $request->getPost('login');
                         $username = $postLogin['username'] ?? '';
                         $password = $postLogin['password'] ?? '';
diff --git a/app/code/core/Mage/Admin/Model/Resource/Acl.php b/app/code/core/Mage/Admin/Model/Resource/Acl.php
index f7ad5dd0a166..b07083b4c706 100644
--- a/app/code/core/Mage/Admin/Model/Resource/Acl.php
+++ b/app/code/core/Mage/Admin/Model/Resource/Acl.php
@@ -148,7 +148,7 @@ public function loadRules(Mage_Admin_Model_Acl $acl, array $rulesArr)
                 Mage::helper('adminhtml')->__(
                     'The following role resources are no longer available in the system: %s. You can delete them by <a href="%s">clicking here</a>.',
                     implode(', ', $orphanedResources),
-                    Mage::helper("adminhtml")->getUrl('adminhtml/permissions_orphanedResource')
+                    Mage::helper('adminhtml')->getUrl('adminhtml/permissions_orphanedResource')
                 )
             );
         }
diff --git a/app/code/core/Mage/Admin/Model/Resource/Roles/Collection.php b/app/code/core/Mage/Admin/Model/Resource/Roles/Collection.php
index 0c50262abd5d..dad38cc5c52c 100644
--- a/app/code/core/Mage/Admin/Model/Resource/Roles/Collection.php
+++ b/app/code/core/Mage/Admin/Model/Resource/Roles/Collection.php
@@ -33,7 +33,7 @@ protected function _initSelect()
     {
         parent::_initSelect();
 
-        $this->getSelect()->where("main_table.role_type = ?", 'G');
+        $this->getSelect()->where('main_table.role_type = ?', 'G');
 
         return $this;
     }
diff --git a/app/code/core/Mage/Admin/Model/Resource/Roles/User/Collection.php b/app/code/core/Mage/Admin/Model/Resource/Roles/User/Collection.php
index c5d3c102903a..74c531cca25a 100644
--- a/app/code/core/Mage/Admin/Model/Resource/Roles/User/Collection.php
+++ b/app/code/core/Mage/Admin/Model/Resource/Roles/User/Collection.php
@@ -33,7 +33,7 @@ protected function _initSelect()
     {
         parent::_initSelect();
 
-        $this->getSelect()->where("user_id > 0");
+        $this->getSelect()->where('user_id > 0');
 
         return $this;
     }
diff --git a/app/code/core/Mage/Admin/Model/Roles.php b/app/code/core/Mage/Admin/Model/Roles.php
index 9ecda32e68d9..ab3d1b57387e 100644
--- a/app/code/core/Mage/Admin/Model/Roles.php
+++ b/app/code/core/Mage/Admin/Model/Roles.php
@@ -146,8 +146,8 @@ protected function _buildResourcesArray(
                 }
 
                 if ($rawNodes) {
-                    $resource->addAttribute("aclpath", $resourceName);
-                    $resource->addAttribute("module_c", $module);
+                    $resource->addAttribute('aclpath', $resourceName);
+                    $resource->addAttribute('module_c', $module);
                 }
 
                 if (is_null($represent2Darray)) {
diff --git a/app/code/core/Mage/Admin/sql/admin_setup/upgrade-1.6.1.1-1.6.1.2.php b/app/code/core/Mage/Admin/sql/admin_setup/upgrade-1.6.1.1-1.6.1.2.php
index 214c224a2873..bae52aea26f4 100644
--- a/app/code/core/Mage/Admin/sql/admin_setup/upgrade-1.6.1.1-1.6.1.2.php
+++ b/app/code/core/Mage/Admin/sql/admin_setup/upgrade-1.6.1.1-1.6.1.2.php
@@ -28,7 +28,7 @@
     ->addColumn('variable_name', Varien_Db_Ddl_Table::TYPE_VARCHAR, 255, [
         'primary'   => true,
         'nullable'  => false,
-        'default'   => "",
+        'default'   => '',
     ], 'Config Path')
     ->addColumn('is_allowed', Varien_Db_Ddl_Table::TYPE_BOOLEAN, null, [
         'nullable'  => false,
@@ -73,7 +73,7 @@
     ], 'Block ID')
     ->addColumn('block_name', Varien_Db_Ddl_Table::TYPE_VARCHAR, 255, [
         'nullable'  => false,
-        'default'   => "",
+        'default'   => '',
     ], 'Block Name')
     ->addColumn('is_allowed', Varien_Db_Ddl_Table::TYPE_BOOLEAN, null, [
         'nullable'  => false,
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/Editroles.php b/app/code/core/Mage/Adminhtml/Block/Api/Editroles.php
index 91a146b3c105..a86d17128c8a 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/Editroles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/Editroles.php
@@ -30,7 +30,7 @@ public function __construct()
     protected function _beforeToHtml()
     {
         $roleId = $this->getRequest()->getParam('rid', false);
-        $role = Mage::getModel("api/roles")
+        $role = Mage::getModel('api/roles')
            ->load($roleId);
 
         $this->addTab('info', [
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/Grid/Role.php b/app/code/core/Mage/Adminhtml/Block/Api/Grid/Role.php
index 9399e10b1782..bb072483a89d 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/Grid/Role.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/Grid/Role.php
@@ -33,7 +33,7 @@ public function __construct()
 
     protected function _prepareCollection()
     {
-        $collection =  Mage::getModel("api/roles")->getCollection();
+        $collection =  Mage::getModel('api/roles')->getCollection();
         $this->setCollection($collection);
 
         return parent::_prepareCollection();
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/Role/Grid/User.php b/app/code/core/Mage/Adminhtml/Block/Api/Role/Grid/User.php
index 22546bb20bd6..804d2273e2fa 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/Role/Grid/User.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/Role/Grid/User.php
@@ -145,7 +145,7 @@ public function getGridUrl()
      */
     protected function _getUsers($json = false)
     {
-        if ($this->getRequest()->getParam('in_role_user') != "") {
+        if ($this->getRequest()->getParam('in_role_user') != '') {
             return (int)$this->getRequest()->getParam('in_role_user');
         }
         $roleId = ($this->getRequest()->getParam('rid') > 0) ? $this->getRequest()->getParam('rid') : Mage::registry('RID');
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/Tab/Rolesusers.php b/app/code/core/Mage/Adminhtml/Block/Api/Tab/Rolesusers.php
index 9c9474002153..44ba406e84be 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/Tab/Rolesusers.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/Tab/Rolesusers.php
@@ -25,7 +25,7 @@ public function __construct()
 
         $roleId = $this->getRequest()->getParam('rid', false);
 
-        $users = Mage::getModel("api/user")->getCollection()->load();
+        $users = Mage::getModel('api/user')->getCollection()->load();
         $this->setTemplate('api/rolesusers.phtml')
             ->assign('users', $users->getItems())
             ->assign('roleId', $roleId);
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/Tab/Userroles.php b/app/code/core/Mage/Adminhtml/Block/Api/Tab/Userroles.php
index d3abcab2e812..3d6d06704dbf 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/Tab/Userroles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/Tab/Userroles.php
@@ -25,11 +25,11 @@ public function __construct()
 
         $uid = $this->getRequest()->getParam('id', false);
         $uid = !empty($uid) ? $uid : 0;
-        $roles = Mage::getModel("api/roles")
+        $roles = Mage::getModel('api/roles')
             ->getCollection()
             ->load();
 
-        $user_roles = Mage::getModel("api/roles")
+        $user_roles = Mage::getModel('api/roles')
             ->getUsersCollection()
             ->setUserFilter($uid)
             ->load();
diff --git a/app/code/core/Mage/Adminhtml/Block/Api/User/Edit/Tab/Roles.php b/app/code/core/Mage/Adminhtml/Block/Api/User/Edit/Tab/Roles.php
index e0b684d12ffc..eefad54c8d37 100644
--- a/app/code/core/Mage/Adminhtml/Block/Api/User/Edit/Tab/Roles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Api/User/Edit/Tab/Roles.php
@@ -103,7 +103,7 @@ public function getGridUrl()
      */
     protected function _getSelectedRoles($json = false)
     {
-        if ($this->getRequest()->getParam('user_roles') != "") {
+        if ($this->getRequest()->getParam('user_roles') != '') {
             return $this->getRequest()->getParam('user_roles');
         }
         $uRoles = Mage::registry('api_user')->getRoles();
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Abstract.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Abstract.php
index 94ce3400af7c..8f0d533dc8c9 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Abstract.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Abstract.php
@@ -163,7 +163,7 @@ public function getSaveUrl(array $args = [])
 
     public function getEditUrl()
     {
-        return $this->getUrl("*/catalog_category/edit", ['_current' => true, 'store' => null, '_query' => false, 'id' => null, 'parent' => null]);
+        return $this->getUrl('*/catalog_category/edit', ['_current' => true, 'store' => null, '_query' => false, 'id' => null, 'parent' => null]);
     }
 
     /**
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Pricestep.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Pricestep.php
index 7c8f8f979c1b..72e1fc4a4c8d 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Pricestep.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Pricestep.php
@@ -29,7 +29,7 @@ class Mage_Adminhtml_Block_Catalog_Category_Helper_Pricestep extends Varien_Data
     public function getToggleCode()
     {
         $htmlId = 'use_config_' . $this->getHtmlId();
-        return "toggleValueElements(this, this.parentNode.parentNode);"
+        return 'toggleValueElements(this, this.parentNode.parentNode);'
             . "if (!this.checked) toggleValueElements($('$htmlId'), $('$htmlId').parentNode);";
     }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Available.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Available.php
index 5b18263637c5..bae54abe7ced 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Available.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Available.php
@@ -29,7 +29,7 @@ class Mage_Adminhtml_Block_Catalog_Category_Helper_Sortby_Available extends Vari
     public function getToggleCode()
     {
         $htmlId = 'use_config_' . $this->getHtmlId();
-        return "toggleValueElements(this, this.parentNode.parentNode);"
+        return 'toggleValueElements(this, this.parentNode.parentNode);'
             . "if (!this.checked) toggleValueElements($('$htmlId'), $('$htmlId').parentNode);";
     }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Default.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Default.php
index 62ad2eb35ab6..91591cc65a44 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Default.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Helper/Sortby/Default.php
@@ -29,7 +29,7 @@ class Mage_Adminhtml_Block_Catalog_Category_Helper_Sortby_Default extends Varien
     public function getToggleCode()
     {
         $htmlId = 'use_config_' . $this->getHtmlId();
-        return "toggleValueElements(this, this.parentNode.parentNode);"
+        return 'toggleValueElements(this, this.parentNode.parentNode);'
             . "if (!this.checked) toggleValueElements($('$htmlId'), $('$htmlId').parentNode);";
     }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tree.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tree.php
index 503a2ed41078..e2d48b66b047 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tree.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Category/Tree.php
@@ -33,7 +33,7 @@ public function __construct()
 
     protected function _prepareLayout()
     {
-        $addUrl = $this->getUrl("*/*/add", [
+        $addUrl = $this->getUrl('*/*/add', [
             '_current' => true,
             'id' => null,
             '_query' => false
@@ -141,7 +141,7 @@ public function getNodesUrl()
     public function getSwitchTreeUrl()
     {
         return $this->getUrl(
-            "*/catalog_category/tree",
+            '*/catalog_category/tree',
             ['_current' => true, 'store' => null, '_query' => false, 'id' => null, 'parent' => null]
         );
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Attribute/Edit/Tab/Main.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Attribute/Edit/Tab/Main.php
index e72ab3107eed..1c38afcf7cba 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Attribute/Edit/Tab/Main.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Attribute/Edit/Tab/Main.php
@@ -148,7 +148,7 @@ protected function _prepareForm()
 
         $fieldset->addField('is_filterable', 'select', [
             'name' => 'is_filterable',
-            'label' => Mage::helper('catalog')->__("Use In Layered Navigation"),
+            'label' => Mage::helper('catalog')->__('Use In Layered Navigation'),
             'title' => Mage::helper('catalog')->__('Can be used only with catalog input type Dropdown, Multiple Select and Price'),
             'note' => Mage::helper('catalog')->__('Can be used only with catalog input type Dropdown, Multiple Select and Price'),
             'values' => [
@@ -160,7 +160,7 @@ protected function _prepareForm()
 
         $fieldset->addField('is_filterable_in_search', 'select', [
             'name' => 'is_filterable_in_search',
-            'label' => Mage::helper('catalog')->__("Use In Search Results Layered Navigation"),
+            'label' => Mage::helper('catalog')->__('Use In Search Results Layered Navigation'),
             'title' => Mage::helper('catalog')->__('Can be used only with catalog input type Dropdown, Multiple Select and Price'),
             'note' => Mage::helper('catalog')->__('Can be used only with catalog input type Dropdown, Multiple Select and Price'),
             'values' => $yesnoSource,
@@ -233,9 +233,9 @@ protected function _prepareForm()
         /** @var Mage_Adminhtml_Block_Widget_Form_Element_Dependence $block */
         $block = $this->getLayout()->createBlock('adminhtml/widget_form_element_dependence');
         $this->setChild('form_after', $block
-            ->addFieldMap("is_wysiwyg_enabled", 'wysiwyg_enabled')
-            ->addFieldMap("is_html_allowed_on_front", 'html_allowed_on_front')
-            ->addFieldMap("frontend_input", 'frontend_input_type')
+            ->addFieldMap('is_wysiwyg_enabled', 'wysiwyg_enabled')
+            ->addFieldMap('is_html_allowed_on_front', 'html_allowed_on_front')
+            ->addFieldMap('frontend_input', 'frontend_input_type')
             ->addFieldDependence('wysiwyg_enabled', 'frontend_input_type', 'textarea')
             ->addFieldDependence('html_allowed_on_front', 'wysiwyg_enabled', '0'));
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery.php b/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery.php
index 4f865355dc8c..dd9369974ac4 100644
--- a/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery.php
+++ b/app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery.php
@@ -79,12 +79,12 @@ public function usedDefault($attribute)
 
         // special management for "label" and "position" since they're columns of the
         // catalog_product_entity_media_gallery_value database table
-        if ($attributeCode == "label" || $attributeCode == "position") {
+        if ($attributeCode == 'label' || $attributeCode == 'position') {
             $media_gallery = $this->getDataObject()->getMediaGallery();
-            if (!count($media_gallery["images"])) {
+            if (!count($media_gallery['images'])) {
                 return true;
             }
-            return $media_gallery["images"][0]["{$attributeCode}_use_default"];
+            return $media_gallery['images'][0]["{$attributeCode}_use_default"];
         }
 
         $defaultValue = $this->getDataObject()->getAttributeDefaultValue($attributeCode);
diff --git a/app/code/core/Mage/Adminhtml/Block/Checkout/Formkey.php b/app/code/core/Mage/Adminhtml/Block/Checkout/Formkey.php
index 3787ccd3f986..d4c668fee439 100644
--- a/app/code/core/Mage/Adminhtml/Block/Checkout/Formkey.php
+++ b/app/code/core/Mage/Adminhtml/Block/Checkout/Formkey.php
@@ -39,6 +39,6 @@ public function canShow()
      */
     public function getSecurityAdminUrl()
     {
-        return Mage::helper("adminhtml")->getUrl('adminhtml/system_config/edit/section/admin');
+        return Mage::helper('adminhtml')->getUrl('adminhtml/system_config/edit/section/admin');
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/Block/Dashboard/Graph.php b/app/code/core/Mage/Adminhtml/Block/Dashboard/Graph.php
index 700d3b3b17d1..5f3870eb050e 100644
--- a/app/code/core/Mage/Adminhtml/Block/Dashboard/Graph.php
+++ b/app/code/core/Mage/Adminhtml/Block/Dashboard/Graph.php
@@ -253,10 +253,10 @@ public function getChartUrl($directUrl = true)
         $this->_allSeries = $datas;
 
         // Image-Charts Awesome data format values
-        $params['chd'] = "a:";
-        $dataDelimiter = ",";
-        $dataSetdelimiter = "|";
-        $dataMissing = "_";
+        $params['chd'] = 'a:';
+        $dataDelimiter = ',';
+        $dataSetdelimiter = '|';
+        $dataMissing = '_';
 
         // process each string in the array, and find the max length
         foreach ($this->getAllSeries() as $index => $serie) {
@@ -321,9 +321,9 @@ public function getChartUrl($directUrl = true)
 
         $params['chd'] .= $buffer;
 
-        $labelBuffer = "";
+        $labelBuffer = '';
         $valueBuffer = [];
-        $rangeBuffer = "";
+        $rangeBuffer = '';
 
         if (count($this->_axisLabels)) {
             $params['chxt'] = implode(',', array_keys($this->_axisLabels));
@@ -353,7 +353,7 @@ public function getChartUrl($directUrl = true)
                                 case '2y':
                                     $formats = Mage::app()->getLocale()->getTranslationList('datetime');
                                     $format = $formats['yyMM'] ?? 'MM/yyyy';
-                                    $format = str_replace(["yyyy", "yy", "MM"], ["Y", "y", "m"], $format);
+                                    $format = str_replace(['yyyy', 'yy', 'MM'], ['Y', 'y', 'm'], $format);
                                     $this->_axisLabels[$idx][$_index] = date($format, strtotime($_label));
                                     break;
                             }
@@ -364,21 +364,21 @@ public function getChartUrl($directUrl = true)
 
                     $tmpstring = implode('|', $this->_axisLabels[$idx]);
 
-                    $valueBuffer[] = $indexid . ":|" . $tmpstring;
+                    $valueBuffer[] = $indexid . ':|' . $tmpstring;
                     if (count($this->_axisLabels[$idx]) > 1) {
                         $deltaX = 100 / (count($this->_axisLabels[$idx]) - 1);
                     } else {
                         $deltaX = 100;
                     }
                 } elseif ($idx === 'y') {
-                    $valueBuffer[] = $indexid . ":|" . implode('|', $yLabels);
+                    $valueBuffer[] = $indexid . ':|' . implode('|', $yLabels);
                     if (count($yLabels) - 1) {
                         $deltaY = 100 / (count($yLabels) - 1);
                     } else {
                         $deltaY = 100;
                     }
                     // setting range values for y axis
-                    $rangeBuffer = $indexid . "," . $miny . "," . $maxy . "|";
+                    $rangeBuffer = $indexid . ',' . $miny . ',' . $maxy . '|';
                 }
                 $indexid++;
             }
diff --git a/app/code/core/Mage/Adminhtml/Block/Newsletter/Queue/Preview.php b/app/code/core/Mage/Adminhtml/Block/Newsletter/Queue/Preview.php
index dabca1b8a51a..17a2eceda816 100644
--- a/app/code/core/Mage/Adminhtml/Block/Newsletter/Queue/Preview.php
+++ b/app/code/core/Mage/Adminhtml/Block/Newsletter/Queue/Preview.php
@@ -49,7 +49,7 @@ protected function _toHtml()
             $storeId = Mage::app()->getAnyStoreView()->getId();
         }
 
-        Varien_Profiler::start("newsletter_queue_proccessing");
+        Varien_Profiler::start('newsletter_queue_proccessing');
         $vars = [];
 
         $vars['subscriber'] = Mage::getModel('newsletter/subscriber');
@@ -59,13 +59,13 @@ protected function _toHtml()
         $template->revertDesign();
 
         if ($template->isPlain()) {
-            $templateProcessed = "<pre>" . htmlspecialchars($templateProcessed) . "</pre>";
+            $templateProcessed = '<pre>' . htmlspecialchars($templateProcessed) . '</pre>';
         }
 
         $templateProcessed = Mage::getSingleton('core/input_filter_maliciousCode')
             ->linkFilter($templateProcessed);
 
-        Varien_Profiler::stop("newsletter_queue_proccessing");
+        Varien_Profiler::stop('newsletter_queue_proccessing');
 
         return $templateProcessed;
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Newsletter/Template/Preview.php b/app/code/core/Mage/Adminhtml/Block/Newsletter/Template/Preview.php
index b66245e6cfa5..673121247bda 100644
--- a/app/code/core/Mage/Adminhtml/Block/Newsletter/Template/Preview.php
+++ b/app/code/core/Mage/Adminhtml/Block/Newsletter/Template/Preview.php
@@ -45,7 +45,7 @@ protected function _toHtml()
             $storeId = Mage::app()->getAnyStoreView()->getId();
         }
 
-        Varien_Profiler::start("newsletter_template_proccessing");
+        Varien_Profiler::start('newsletter_template_proccessing');
         $vars = [];
 
         $vars['subscriber'] = Mage::getModel('newsletter/subscriber');
@@ -58,13 +58,13 @@ protected function _toHtml()
         $template->revertDesign();
 
         if ($template->isPlain()) {
-            $templateProcessed = "<pre>" . htmlspecialchars($templateProcessed) . "</pre>";
+            $templateProcessed = '<pre>' . htmlspecialchars($templateProcessed) . '</pre>';
         }
 
         $templateProcessed = Mage::getSingleton('core/input_filter_maliciousCode')
             ->linkFilter($templateProcessed);
 
-        Varien_Profiler::stop("newsletter_template_proccessing");
+        Varien_Profiler::stop('newsletter_template_proccessing');
 
         return $templateProcessed;
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Notification/Curl.php b/app/code/core/Mage/Adminhtml/Block/Notification/Curl.php
index 0f95b91ce962..e6fe15454c1d 100644
--- a/app/code/core/Mage/Adminhtml/Block/Notification/Curl.php
+++ b/app/code/core/Mage/Adminhtml/Block/Notification/Curl.php
@@ -63,7 +63,7 @@ protected function _canShow()
     public function getMessage()
     {
         return $this->helper('adminhtml')->__(
-            "Your current version of cURL php5 module is %s, which can prevent services that require TLS v1.2 from working correctly. It is recommended to update your cURL php5 module to version %s or higher.",
+            'Your current version of cURL php5 module is %s, which can prevent services that require TLS v1.2 from working correctly. It is recommended to update your cURL php5 module to version %s or higher.',
             $this->_curlVersion['version'],
             $this::REQUIRED_CURL_VERSION
         );
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/Role.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/Role.php
index 0387623ca76b..9ade3099fb6c 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/Role.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/Role.php
@@ -33,7 +33,7 @@ public function __construct()
 
     protected function _prepareCollection()
     {
-        $collection =  Mage::getModel("admin/roles")->getCollection();
+        $collection =  Mage::getModel('admin/roles')->getCollection();
         $this->setCollection($collection);
 
         return parent::_prepareCollection();
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/User.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/User.php
index 6b92fe40e471..6d1fcc5e819b 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/User.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Grid/User.php
@@ -32,7 +32,7 @@ public function __construct()
 
     protected function _prepareCollection()
     {
-        $collection =  Mage::getModel("permissions/users")->getCollection();
+        $collection =  Mage::getModel('permissions/users')->getCollection();
         $this->setCollection($collection);
 
         return parent::_prepareCollection();
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Role/Grid/User.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Role/Grid/User.php
index 197df5b29af5..1794f7abfbd2 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Role/Grid/User.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Role/Grid/User.php
@@ -141,7 +141,7 @@ public function getGridUrl()
 
     protected function _getUsers($json = false)
     {
-        if ($this->getRequest()->getParam('in_role_user') != "") {
+        if ($this->getRequest()->getParam('in_role_user') != '') {
             return $this->getRequest()->getParam('in_role_user');
         }
         $roleId = ($this->getRequest()->getParam('rid') > 0) ? $this->getRequest()->getParam('rid') : Mage::registry('RID');
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Rolesusers.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Rolesusers.php
index 21d6c748f7a8..53a164d42a4d 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Rolesusers.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Rolesusers.php
@@ -25,7 +25,7 @@ public function __construct()
 
         $roleId = $this->getRequest()->getParam('rid', false);
 
-        $users = Mage::getModel("admin/user")->getCollection()->load();
+        $users = Mage::getModel('admin/user')->getCollection()->load();
         $this->setTemplate('permissions/rolesusers.phtml')
             ->assign('users', $users->getItems())
             ->assign('roleId', $roleId);
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Userroles.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Userroles.php
index 65af2a7cd76f..4b04f26b5ad1 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Userroles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Tab/Userroles.php
@@ -25,11 +25,11 @@ public function __construct()
 
         $uid = $this->getRequest()->getParam('id', false);
         $uid = !empty($uid) ? $uid : 0;
-        $roles = Mage::getModel("admin/roles")
+        $roles = Mage::getModel('admin/roles')
             ->getCollection()
             ->load();
 
-        $user_roles = Mage::getModel("admin/roles")
+        $user_roles = Mage::getModel('admin/roles')
             ->getUsersCollection()
             ->setUserFilter($uid)
             ->load();
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Roles.php b/app/code/core/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Roles.php
index bb05bfb8292d..2a6be3175d26 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Roles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Roles.php
@@ -92,7 +92,7 @@ public function getGridUrl()
 
     protected function _getSelectedRoles($json = false)
     {
-        if ($this->getRequest()->getParam('user_roles') != "") {
+        if ($this->getRequest()->getParam('user_roles') != '') {
             return $this->getRequest()->getParam('user_roles');
         }
         /** @var Mage_Admin_Model_User $user */
diff --git a/app/code/core/Mage/Adminhtml/Block/Permissions/Usernroles.php b/app/code/core/Mage/Adminhtml/Block/Permissions/Usernroles.php
index e2c91d0a2568..581de16e5583 100644
--- a/app/code/core/Mage/Adminhtml/Block/Permissions/Usernroles.php
+++ b/app/code/core/Mage/Adminhtml/Block/Permissions/Usernroles.php
@@ -22,8 +22,8 @@ class Mage_Adminhtml_Block_Permissions_UsernRoles extends Mage_Adminhtml_Block_T
     public function __construct()
     {
         parent::__construct();
-        $userCollection = Mage::getModel("permissions/users")->getCollection()->load();
-        $rolesCollection = Mage::getModel("permissions/roles")->getCollection()->load();
+        $userCollection = Mage::getModel('permissions/users')->getCollection()->load();
+        $rolesCollection = Mage::getModel('permissions/roles')->getCollection()->load();
 
         $this->setTemplate('permissions/usernroles.phtml')
             ->assign('users', $userCollection)
diff --git a/app/code/core/Mage/Adminhtml/Block/Rating/Edit.php b/app/code/core/Mage/Adminhtml/Block/Rating/Edit.php
index 87dadb63cc0e..656ee9a8040b 100644
--- a/app/code/core/Mage/Adminhtml/Block/Rating/Edit.php
+++ b/app/code/core/Mage/Adminhtml/Block/Rating/Edit.php
@@ -44,7 +44,7 @@ public function __construct()
     public function getHeaderText()
     {
         if (Mage::registry('rating_data') && Mage::registry('rating_data')->getId()) {
-            return Mage::helper('rating')->__("Edit Rating", $this->escapeHtml(Mage::registry('rating_data')->getRatingCode()));
+            return Mage::helper('rating')->__('Edit Rating', $this->escapeHtml(Mage::registry('rating_data')->getRatingCode()));
         }
         return Mage::helper('rating')->__('New Rating');
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Report/Grid/Column/Renderer/Currency.php b/app/code/core/Mage/Adminhtml/Block/Report/Grid/Column/Renderer/Currency.php
index bf9b64a0ea6d..92c8643a11a6 100644
--- a/app/code/core/Mage/Adminhtml/Block/Report/Grid/Column/Renderer/Currency.php
+++ b/app/code/core/Mage/Adminhtml/Block/Report/Grid/Column/Renderer/Currency.php
@@ -37,7 +37,7 @@ public function render(Varien_Object $row)
         }
 
         $data = (float) $data * $this->_getRate($row);
-        $data = sprintf("%F", $data);
+        $data = sprintf('%F', $data);
         $data = Mage::app()->getLocale()->currency($currency_code)->toCurrency($data);
         return $data;
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create.php b/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create.php
index e4ede5c80268..2a834b568784 100644
--- a/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create.php
+++ b/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create.php
@@ -36,7 +36,7 @@ public function __construct()
         $storeId    = $this->_getSession()->getStoreId();
 
         $this->_updateButton('save', 'label', Mage::helper('sales')->__('Submit Order'));
-        $this->_updateButton('save', 'onclick', "order.submit()");
+        $this->_updateButton('save', 'onclick', 'order.submit()');
         $this->_updateButton('save', 'id', 'submit_order_top_button');
         if (is_null($customerId) || !$storeId) {
             $this->_updateButton('save', 'style', 'display:none');
diff --git a/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create/Items/Grid.php b/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create/Items/Grid.php
index 112972224197..31340158816a 100644
--- a/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create/Items/Grid.php
+++ b/app/code/core/Mage/Adminhtml/Block/Sales/Order/Create/Items/Grid.php
@@ -458,7 +458,7 @@ public function isMoveToWishlistAllowed($item)
      */
     public function getCustomerWishlists()
     {
-        return Mage::getModel("wishlist/wishlist")->getCollection()
+        return Mage::getModel('wishlist/wishlist')->getCollection()
             ->filterByCustomerId($this->getCustomerId());
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/Block/Sales/Order/View/Tab/History.php b/app/code/core/Mage/Adminhtml/Block/Sales/Order/View/Tab/History.php
index 1ebb1a7e1c32..02d063b64aac 100644
--- a/app/code/core/Mage/Adminhtml/Block/Sales/Order/View/Tab/History.php
+++ b/app/code/core/Mage/Adminhtml/Block/Sales/Order/View/Tab/History.php
@@ -116,7 +116,7 @@ public function getFullHistory()
             );
         }
 
-        usort($history, [__CLASS__, "_sortHistoryByTimestamp"]);
+        usort($history, [__CLASS__, '_sortHistoryByTimestamp']);
         return $history;
     }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Sales/Transactions/Detail.php b/app/code/core/Mage/Adminhtml/Block/Sales/Transactions/Detail.php
index 76582ddff10e..c0b83ee96acb 100644
--- a/app/code/core/Mage/Adminhtml/Block/Sales/Transactions/Detail.php
+++ b/app/code/core/Mage/Adminhtml/Block/Sales/Transactions/Detail.php
@@ -64,7 +64,7 @@ public function __construct()
     public function getHeaderText()
     {
         return Mage::helper('sales')->__(
-            "Transaction # %s | %s",
+            'Transaction # %s | %s',
             $this->_txn->getTxnId(),
             $this->formatDate(
                 $this->_txn->getCreatedAt(),
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Export.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Export.php
index 4f61ac0d4cce..961c4b2fc415 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Export.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Export.php
@@ -34,7 +34,7 @@ public function getElementHtml()
 
         $data = [
             'label'     => Mage::helper('adminhtml')->__('Export CSV'),
-            'onclick'   => 'setLocation(\'' . Mage::helper('adminhtml')->getUrl("*/*/exportTablerates", $params) . 'conditionName/\' + $(\'carriers_tablerate_condition_name\').value + \'/tablerates.csv\' )',
+            'onclick'   => 'setLocation(\'' . Mage::helper('adminhtml')->getUrl('*/*/exportTablerates', $params) . 'conditionName/\' + $(\'carriers_tablerate_condition_name\').value + \'/tablerates.csv\' )',
             'class'     => '',
         ];
 
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Tabs.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Tabs.php
index 861de52c6034..3871b4a9a5f8 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Config/Tabs.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Tabs.php
@@ -302,7 +302,7 @@ public function checkSectionPermissions($code = null)
     {
         static $permissions;
 
-        if (!$code || trim($code) == "") {
+        if (!$code || trim($code) == '') {
             return false;
         }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Convert/Gui/Edit/Tab/Wizard.php b/app/code/core/Mage/Adminhtml/Block/System/Convert/Gui/Edit/Tab/Wizard.php
index 40c2a54fd93f..13abc90c8a00 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Convert/Gui/Edit/Tab/Wizard.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Convert/Gui/Edit/Tab/Wizard.php
@@ -128,7 +128,7 @@ public function getAddMapButtonHtml()
         if (!$this->_addMapButtonHtml) {
             $this->_addMapButtonHtml = $this->getLayout()->createBlock('adminhtml/widget_button')->setType('button')
                 ->setClass('add')->setLabel($this->__('Add Field Mapping'))
-                ->setOnClick("addFieldMapping()")->toHtml();
+                ->setOnClick('addFieldMapping()')->toHtml();
         }
         return $this->_addMapButtonHtml;
     }
@@ -141,7 +141,7 @@ public function getRemoveMapButtonHtml()
         if (!$this->_removeMapButtonHtml) {
             $this->_removeMapButtonHtml = $this->getLayout()->createBlock('adminhtml/widget_button')->setType('button')
                 ->setClass('delete')->setLabel($this->__('Remove'))
-                ->setOnClick("removeFieldMapping(this)")->toHtml();
+                ->setOnClick('removeFieldMapping(this)')->toHtml();
         }
         return $this->_removeMapButtonHtml;
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Convert/Profile/Run.php b/app/code/core/Mage/Adminhtml/Block/System/Convert/Profile/Run.php
index 9bc83a880e21..0311bc9c7204 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Convert/Profile/Run.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Convert/Profile/Run.php
@@ -177,10 +177,10 @@ public function getExceptions()
                     break;
             }
             $exceptions[] = [
-                    "style"     => $liStyle,
-                    "src"       => Mage::getDesign()->getSkinUrl('images/' . $img),
-                    "message"   => $e->getMessage(),
-                    "position" => $e->getPosition()
+                    'style'     => $liStyle,
+                    'src'       => Mage::getDesign()->getSkinUrl('images/' . $img),
+                    'message'   => $e->getMessage(),
+                    'position'  => $e->getPosition()
                 ];
         }
         parent::setExceptions($exceptions);
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Email/Template/Preview.php b/app/code/core/Mage/Adminhtml/Block/System/Email/Template/Preview.php
index ee8319388f56..b0786525b358 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Email/Template/Preview.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Email/Template/Preview.php
@@ -54,16 +54,16 @@ protected function _toHtml()
             $this->maliciousCodeFilter($template->getTemplateText())
         );
 
-        Varien_Profiler::start("email_template_proccessing");
+        Varien_Profiler::start('email_template_proccessing');
         $vars = [];
 
         $templateProcessed = $template->getProcessedTemplate($vars, true);
 
         if ($template->isPlain()) {
-            $templateProcessed = "<pre>" . htmlspecialchars($templateProcessed) . "</pre>";
+            $templateProcessed = '<pre>' . htmlspecialchars($templateProcessed) . '</pre>';
         }
 
-        Varien_Profiler::stop("email_template_proccessing");
+        Varien_Profiler::stop('email_template_proccessing');
 
         // Stop store emulation process
         $appEmulation->stopEnvironmentEmulation($initialEnvironmentInfo);
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Group.php b/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Group.php
index bec54cff8b85..addf1580d4ad 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Group.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Group.php
@@ -36,7 +36,7 @@ protected function _prepareLayout()
             $this->getLayout()->createBlock('adminhtml/widget_button')
                 ->setData([
                     'label'     => Mage::helper('core')->__('Delete Store'),
-                    'onclick'   => "deleteForm.submit()",
+                    'onclick'   => 'deleteForm.submit()',
                     'class'     => 'cancel'
                 ])
         );
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Website.php b/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Website.php
index bffd0edfc581..115a5e50cae2 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Website.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Store/Delete/Website.php
@@ -36,7 +36,7 @@ protected function _prepareLayout()
             $this->getLayout()->createBlock('adminhtml/widget_button')
                 ->setData([
                     'label'     => Mage::helper('core')->__('Delete Website'),
-                    'onclick'   => "deleteForm.submit()",
+                    'onclick'   => 'deleteForm.submit()',
                     'class'     => 'cancel'
                 ])
         );
diff --git a/app/code/core/Mage/Adminhtml/Block/Tax/Rule/Edit.php b/app/code/core/Mage/Adminhtml/Block/Tax/Rule/Edit.php
index 47453d99d7b8..2086b80027ce 100644
--- a/app/code/core/Mage/Adminhtml/Block/Tax/Rule/Edit.php
+++ b/app/code/core/Mage/Adminhtml/Block/Tax/Rule/Edit.php
@@ -48,7 +48,7 @@ public function __construct()
     public function getHeaderText()
     {
         if (Mage::registry('tax_rule')->getId()) {
-            return Mage::helper('tax')->__("Edit Rule");
+            return Mage::helper('tax')->__('Edit Rule');
         }
         return Mage::helper('tax')->__('New Rule');
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Form/Element/Gallery.php b/app/code/core/Mage/Adminhtml/Block/Widget/Form/Element/Gallery.php
index 25da4427d284..90ac04bed96f 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Form/Element/Gallery.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Form/Element/Gallery.php
@@ -57,7 +57,7 @@ protected function _prepareLayout()
             $this->getLayout()->createBlock('adminhtml/widget_button')
                 ->setData([
                     'label'     => Mage::helper('adminhtml')->__('Delete'),
-                    'onclick'   => "deleteImage(#image#)",
+                    'onclick'   => 'deleteImage(#image#)',
                     'class' => 'delete'
             ])
         );
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php
index af36a2379245..b08285cf842a 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php
@@ -1134,7 +1134,7 @@ protected function _exportCsvItem(Varien_Object $item, Varien_Io_File $adapter)
         }
 
         $adapter->streamWriteCsv(
-            Mage::helper("core")->getEscapedCSVData($row)
+            Mage::helper('core')->getEscapedCSVData($row)
         );
     }
 
@@ -1167,7 +1167,7 @@ public function getCsvFile()
 
         if ($this->getCountTotals()) {
             $io->streamWriteCsv(
-                Mage::helper("core")->getEscapedCSVData($this->_getExportTotals())
+                Mage::helper('core')->getEscapedCSVData($this->_getExportTotals())
             );
         }
 
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Checkbox.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Checkbox.php
index b9d7f43aa0a1..0c747a9defc7 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Checkbox.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Checkbox.php
@@ -64,7 +64,7 @@ public function render(Varien_Object $row)
         if ($this->getNoObjectId() || $this->getColumn()->getUseIndex()) {
             $v = $value;
         } else {
-            $v = ($row->getId() != "") ? $row->getId() : $value;
+            $v = ($row->getId() != '') ? $row->getId() : $value;
         }
 
         return $this->_getCheckboxHtml($v, $checked);
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Currency.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Currency.php
index 860874681421..4e9f59304888 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Currency.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Currency.php
@@ -45,7 +45,7 @@ public function render(Varien_Object $row)
 
             $data = (float) $data * $this->_getRate($row);
             $sign = (bool)(int)$this->getColumn()->getShowNumberSign() && ($data > 0) ? '+' : '';
-            $data = sprintf("%F", $data);
+            $data = sprintf('%F', $data);
             $data = Mage::app()->getLocale()->currency($currency_code)->toCurrency($data);
             return $sign . $data;
         }
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Price.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Price.php
index 8647483d4a00..a09ace5bfd87 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Price.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Price.php
@@ -43,7 +43,7 @@ public function render(Varien_Object $row)
             }
 
             $data = (float) $data * $this->_getRate($row);
-            $data = sprintf("%F", $data);
+            $data = sprintf('%F', $data);
             $data = Mage::app()->getLocale()->currency($currency_code)->toCurrency($data);
             return $data;
         }
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Wrapline.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Wrapline.php
index 281c859e4e69..ca9a0b653f56 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Wrapline.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Renderer/Wrapline.php
@@ -42,7 +42,7 @@ public function render(Varien_Object $row)
             ? $this->getColumn()->getData('lineLength')
             : $this->_defaultMaxLineLength;
         for ($i = 0, $n = floor(Mage::helper('core/string')->strlen($line) / $lineLength); $i <= $n; $i++) {
-            $wrappedLine .= Mage::helper('core/string')->substr($line, ($lineLength * $i), $lineLength) . "<br />";
+            $wrappedLine .= Mage::helper('core/string')->substr($line, ($lineLength * $i), $lineLength) . '<br />';
         }
         return $wrappedLine;
     }
diff --git a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Massaction/Abstract.php b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Massaction/Abstract.php
index 886f76e971dc..a7abf519cb5f 100644
--- a/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Massaction/Abstract.php
+++ b/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Massaction/Abstract.php
@@ -252,7 +252,7 @@ public function getSelected()
      */
     public function getApplyButtonHtml()
     {
-        return $this->getButtonHtml($this->__('Submit'), $this->getJsObjectName() . ".apply()");
+        return $this->getButtonHtml($this->__('Submit'), $this->getJsObjectName() . '.apply()');
     }
 
     /**
@@ -282,7 +282,7 @@ public function getGridIdsJson()
         $gridIds = $this->getParentBlock()->getCollection()->getAllIds();
 
         if (!empty($gridIds)) {
-            return implode(",", $gridIds);
+            return implode(',', $gridIds);
         }
         return '';
     }
diff --git a/app/code/core/Mage/Adminhtml/Controller/Action.php b/app/code/core/Mage/Adminhtml/Controller/Action.php
index ec3fd52958d8..4f1d37c86404 100644
--- a/app/code/core/Mage/Adminhtml/Controller/Action.php
+++ b/app/code/core/Mage/Adminhtml/Controller/Action.php
@@ -152,9 +152,9 @@ public function preDispatch()
     {
         // get legacy theme choice form backend config
         if (Mage::getStoreConfigFlag('admin/design/use_legacy_theme')) {
-            $theme = Mage::getConfig()->getNode("stores/admin/design/theme/default");
+            $theme = Mage::getConfig()->getNode('stores/admin/design/theme/default');
         } else {
-            $theme = Mage::getConfig()->getNode("stores/admin/design/theme/openmage");
+            $theme = Mage::getConfig()->getNode('stores/admin/design/theme/openmage');
         }
 
         Mage::getDesign()
diff --git a/app/code/core/Mage/Adminhtml/Model/Customer/Renderer/Region.php b/app/code/core/Mage/Adminhtml/Model/Customer/Renderer/Region.php
index d5db077f2ceb..f22deaaab277 100644
--- a/app/code/core/Mage/Adminhtml/Model/Customer/Renderer/Region.php
+++ b/app/code/core/Mage/Adminhtml/Model/Customer/Renderer/Region.php
@@ -80,7 +80,7 @@ public function render(Varien_Data_Form_Element_Abstract $element)
                  . $element->serialize($htmlAttributes) . '>' . "\n";
             foreach ($regionCollection as $region) {
                 $selected = ($regionId == $region['value']) ? ' selected="selected"' : '';
-                $value =  is_numeric($region['value']) ? (int)$region['value'] : "";
+                $value =  is_numeric($region['value']) ? (int)$region['value'] : '';
                 $html .= '<option value="' . $value . '"' . $selected . '>'
                     . Mage::helper('adminhtml')->escapeHtml(Mage::helper('directory')->__($region['label']))
                     . '</option>';
@@ -101,7 +101,7 @@ public function render(Varien_Data_Form_Element_Abstract $element)
             $html .= '<td class="value">';
             $html .= '<input id="' . $regionHtmlId . '" name="' . $regionHtmlName
                 . '" value="' . $element->getEscapedValue() . '" '
-                . $element->serialize($htmlAttributes) . "/>" . "\n";
+                . $element->serialize($htmlAttributes) . '/>' . "\n";
             $html .= '<input type="hidden" name="' . $regionIdHtmlName . '" id="' . $regionIdHtmlId . '" value=""/>';
             $html .= '</td>' . "\n";
         }
diff --git a/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Basedon.php b/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Basedon.php
index 54ee3ea831f6..8a127356fd31 100644
--- a/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Basedon.php
+++ b/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Basedon.php
@@ -24,7 +24,7 @@ public function toOptionArray()
         return [
             ['value' => 'shipping', 'label' => Mage::helper('adminhtml')->__('Shipping Address')],
             ['value' => 'billing', 'label' => Mage::helper('adminhtml')->__('Billing Address')],
-            ['value' => 'origin', 'label' => Mage::helper('adminhtml')->__("Shipping Origin")],
+            ['value' => 'origin', 'label' => Mage::helper('adminhtml')->__('Shipping Origin')],
         ];
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Catalog.php b/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Catalog.php
index 4c0be87b86d3..785ccd48ce38 100644
--- a/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Catalog.php
+++ b/app/code/core/Mage/Adminhtml/Model/System/Config/Source/Tax/Catalog.php
@@ -24,7 +24,7 @@ public function toOptionArray()
         return [
             ['value' => 0, 'label' => Mage::helper('adminhtml')->__('No (price without tax)')],
             ['value' => 1, 'label' => Mage::helper('adminhtml')->__('Yes (only price with tax)')],
-            ['value' => 2, 'label' => Mage::helper('adminhtml')->__("Both (without and with tax)")],
+            ['value' => 2, 'label' => Mage::helper('adminhtml')->__('Both (without and with tax)')],
         ];
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/controllers/Api/RoleController.php b/app/code/core/Mage/Adminhtml/controllers/Api/RoleController.php
index ca5b01fa9279..75e0d2a2ed72 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Api/RoleController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Api/RoleController.php
@@ -125,13 +125,13 @@ public function deleteAction()
         }
 
         try {
-            Mage::getModel("api/roles")->load($rid)->delete();
+            Mage::getModel('api/roles')->load($rid)->delete();
             Mage::getSingleton('adminhtml/session')->addSuccess($this->__('The role has been deleted.'));
         } catch (Exception $e) {
             Mage::getSingleton('adminhtml/session')->addError($this->__('An error occurred while deleting this role.'));
         }
 
-        $this->_redirect("*/*/");
+        $this->_redirect('*/*/');
     }
 
     public function saveRoleAction()
@@ -168,7 +168,7 @@ public function saveRoleAction()
 
         $isAll = $this->getRequest()->getParam('all');
         if ($isAll) {
-            $resource = ["all"];
+            $resource = ['all'];
         }
 
         try {
@@ -178,7 +178,7 @@ public function saveRoleAction()
                     ->setRoleType('G')
                     ->save();
 
-            Mage::getModel("api/rules")
+            Mage::getModel('api/rules')
                 ->setRoleId($role->getId())
                 ->setResources($resource)
                 ->saveRel();
@@ -208,7 +208,7 @@ public function editrolegridAction()
     protected function _deleteUserFromRole($userId, $roleId)
     {
         try {
-            Mage::getModel("api/user")
+            Mage::getModel('api/user')
                 ->setRoleId($roleId)
                 ->setUserId($userId)
                 ->deleteFromRole();
@@ -220,7 +220,7 @@ protected function _deleteUserFromRole($userId, $roleId)
 
     protected function _addUserToRole($userId, $roleId)
     {
-        $user = Mage::getModel("api/user")->load($userId);
+        $user = Mage::getModel('api/user')->load($userId);
         $user->setRoleId($roleId)->setUserId($userId);
 
         if ($user->roleUserExists() === true) {
diff --git a/app/code/core/Mage/Adminhtml/controllers/CacheController.php b/app/code/core/Mage/Adminhtml/controllers/CacheController.php
index 80d701b0788f..407caba728e1 100644
--- a/app/code/core/Mage/Adminhtml/controllers/CacheController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/CacheController.php
@@ -54,7 +54,7 @@ public function flushAllAction()
     {
         Mage::app()->getCacheInstance()->flush();
         Mage::dispatchEvent('adminhtml_cache_flush_all');
-        $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__("The cache storage has been flushed."));
+        $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__('The cache storage has been flushed.'));
         $this->_redirect('*/*');
     }
 
@@ -76,7 +76,7 @@ public function flushSystemAction()
             Mage::getConfig()->releaseCacheSaveLock();
         }
         Mage::dispatchEvent('adminhtml_cache_flush_system');
-        $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__("The OpenMage cache has been flushed and updates applied."));
+        $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__('The OpenMage cache has been flushed and updates applied.'));
         $this->_redirect('*/*');
     }
 
@@ -97,7 +97,7 @@ public function massEnableAction()
         }
         if ($updatedTypes > 0) {
             Mage::app()->saveUseCache($allTypes);
-            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__("%s cache type(s) enabled.", $updatedTypes));
+            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__('%s cache type(s) enabled.', $updatedTypes));
         }
         $this->_redirect('*/*');
     }
@@ -120,7 +120,7 @@ public function massDisableAction()
         }
         if ($updatedTypes > 0) {
             Mage::app()->saveUseCache($allTypes);
-            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__("%s cache type(s) disabled.", $updatedTypes));
+            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__('%s cache type(s) disabled.', $updatedTypes));
         }
         $this->_redirect('*/*');
     }
@@ -140,7 +140,7 @@ public function massRefreshAction()
             }
         }
         if ($updatedTypes > 0) {
-            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__("%s cache type(s) refreshed.", $updatedTypes));
+            $this->_getSession()->addSuccess(Mage::helper('adminhtml')->__('%s cache type(s) refreshed.', $updatedTypes));
         }
         $this->_redirect('*/*');
     }
diff --git a/app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php b/app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php
index ad534a4be6cb..78bb850604ec 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php
@@ -320,7 +320,7 @@ public function saveAction()
              * Proceed with $_POST['use_config']
              * set into category model for proccessing through validation
              */
-            $category->setData("use_post_data_config", $this->getRequest()->getPost('use_config'));
+            $category->setData('use_post_data_config', $this->getRequest()->getPost('use_config'));
 
             try {
                 $validate = $category->validate();
@@ -375,7 +375,7 @@ public function moveAction()
         $category->setData('save_rewrites_history', Mage::helper('catalog')->shouldSaveUrlRewritesHistory());
         try {
             $category->move($parentNodeId, $prevNodeId);
-            $this->getResponse()->setBody("SUCCESS");
+            $this->getResponse()->setBody('SUCCESS');
         } catch (Mage_Core_Exception $e) {
             $this->getResponse()->setBody($e->getMessage());
         } catch (Exception $e) {
diff --git a/app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php b/app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php
index 99e5975584fc..58c0f9c5ced4 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php
@@ -56,8 +56,8 @@ public function uploadAction()
             /**
              * Workaround for prototype 1.7 methods "isJSON", "evalJSON" on Windows OS
              */
-            $result['tmp_name'] = str_replace(DS, "/", $result['tmp_name']);
-            $result['path'] = str_replace(DS, "/", $result['path']);
+            $result['tmp_name'] = str_replace(DS, '/', $result['tmp_name']);
+            $result['path'] = str_replace(DS, '/', $result['path']);
 
             $result['url'] = Mage::getSingleton('catalog/product_media_config')->getTmpMediaUrl($result['file']);
             $result['file'] = $result['file'] . '.tmp';
diff --git a/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php b/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php
index c5fc49a0e20b..6e8df72ded7d 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php
@@ -97,7 +97,7 @@ protected function _initProduct()
             $productType = $product->getTypeInstance();
             if (!$productId || !$productType->getUsedProductAttributeIds()) {
                 $productType->setUsedProductAttributeIds(
-                    explode(",", base64_decode(urldecode($attributes)))
+                    explode(',', base64_decode(urldecode($attributes)))
                 );
             }
         }
@@ -106,7 +106,7 @@ protected function _initProduct()
         if ($this->getRequest()->getParam('popup')
             && $requiredAttributes = $this->getRequest()->getParam('required')
         ) {
-            $requiredAttributes = explode(",", $requiredAttributes);
+            $requiredAttributes = explode(',', $requiredAttributes);
             foreach ($product->getAttributes() as $attribute) {
                 if (in_array($attribute->getId(), $requiredAttributes)) {
                     $attribute->setIsRequired(1);
diff --git a/app/code/core/Mage/Adminhtml/controllers/Cms/BlockController.php b/app/code/core/Mage/Adminhtml/controllers/Cms/BlockController.php
index 78d358af8b34..6ba8ede730ee 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Cms/BlockController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Cms/BlockController.php
@@ -168,7 +168,7 @@ public function deleteAction()
     {
         // check if we know what should be deleted
         if ($id = $this->getRequest()->getParam('block_id')) {
-            $title = "";
+            $title = '';
             try {
                 // init model and delete
                 $model = Mage::getModel('cms/block');
diff --git a/app/code/core/Mage/Adminhtml/controllers/Cms/PageController.php b/app/code/core/Mage/Adminhtml/controllers/Cms/PageController.php
index 9924aa899827..7ff8117718a6 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Cms/PageController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Cms/PageController.php
@@ -175,7 +175,7 @@ public function deleteAction()
     {
         // check if we know what should be deleted
         if ($id = $this->getRequest()->getParam('page_id')) {
-            $title = "";
+            $title = '';
             try {
                 // init model and delete
                 $model = Mage::getModel('cms/page');
diff --git a/app/code/core/Mage/Adminhtml/controllers/IndexController.php b/app/code/core/Mage/Adminhtml/controllers/IndexController.php
index 0918021f0f29..555e630f9b74 100644
--- a/app/code/core/Mage/Adminhtml/controllers/IndexController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/IndexController.php
@@ -89,7 +89,7 @@ public function logoutAction()
      */
     public function globalSearchAction()
     {
-        $searchModules = Mage::getConfig()->getNode("adminhtml/global_search");
+        $searchModules = Mage::getConfig()->getNode('adminhtml/global_search');
         $items = [];
 
         if (!Mage::getStoreConfigFlag('admin/global_search/enable') || !Mage::getSingleton('admin/session')->isAllowed('admin/global_search')) {
diff --git a/app/code/core/Mage/Adminhtml/controllers/RatingController.php b/app/code/core/Mage/Adminhtml/controllers/RatingController.php
index 08a1d5fa62c9..64e01257890b 100644
--- a/app/code/core/Mage/Adminhtml/controllers/RatingController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/RatingController.php
@@ -92,7 +92,7 @@ public function saveAction()
                     $i = 1;
                     foreach ($options as $key => $optionCode) {
                         $optionModel = Mage::getModel('rating/rating_option');
-                        if (!preg_match("/^add_([0-9]*?)$/", $key)) {
+                        if (!preg_match('/^add_([0-9]*?)$/', $key)) {
                             $optionModel->setId($key);
                         }
 
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/Billing/AgreementController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/Billing/AgreementController.php
index a5cabb872cf8..2a3dd9921647 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/Billing/AgreementController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/Billing/AgreementController.php
@@ -56,7 +56,7 @@ public function viewAction()
         if ($agreementModel) {
             $this->_title($this->__('Sales'))
                 ->_title($this->__('Billing Agreements'))
-                ->_title(sprintf("#%s", $agreementModel->getReferenceId()));
+                ->_title(sprintf('#%s', $agreementModel->getReferenceId()));
 
             $this->loadLayout()
                 ->_setActiveMenu('sales/billing_agreement')
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/CreditmemoController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/CreditmemoController.php
index 8ad63eb97ae6..36bacef02c7e 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/CreditmemoController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/CreditmemoController.php
@@ -179,7 +179,7 @@ public function viewAction()
     {
         $creditmemo = $this->_initCreditmemo();
         if ($creditmemo) {
-            $this->_title(sprintf("#%s", $creditmemo->getIncrementId()));
+            $this->_title(sprintf('#%s', $creditmemo->getIncrementId()));
 
             $this->loadLayout();
 
@@ -212,9 +212,9 @@ public function newAction()
     {
         if ($creditmemo = $this->_initCreditmemo()) {
             if ($creditmemo->getInvoice()) {
-                $this->_title($this->__("New Memo for #%s", $creditmemo->getInvoice()->getIncrementId()));
+                $this->_title($this->__('New Memo for #%s', $creditmemo->getInvoice()->getIncrementId()));
             } else {
-                $this->_title($this->__("New Memo"));
+                $this->_title($this->__('New Memo'));
             }
 
             if ($comment = Mage::getSingleton('adminhtml/session')->getCommentText(true)) {
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/InvoiceController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/InvoiceController.php
index f382469a91c8..2319d945f5ed 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/InvoiceController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/InvoiceController.php
@@ -130,7 +130,7 @@ public function viewAction()
     {
         $invoice = $this->_initInvoice();
         if ($invoice) {
-            $this->_title(sprintf("#%s", $invoice->getIncrementId()));
+            $this->_title(sprintf('#%s', $invoice->getIncrementId()));
 
             $this->loadLayout()
                 ->_setActiveMenu('sales/invoice');
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/ShipmentController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/ShipmentController.php
index dd803294b5a9..ae7a56568ecb 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/Order/ShipmentController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/Order/ShipmentController.php
@@ -119,7 +119,7 @@ public function viewAction()
     {
         $shipment = $this->_initShipment();
         if ($shipment) {
-            $this->_title(sprintf("#%s", $shipment->getIncrementId()));
+            $this->_title(sprintf('#%s', $shipment->getIncrementId()));
 
             $this->loadLayout();
 
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php
index de4a727492be..74dc1789a6c6 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php
@@ -110,7 +110,7 @@ public function viewAction()
 
             $this->_initAction();
 
-            $this->_title(sprintf("#%s", $order->getRealOrderId()));
+            $this->_title(sprintf('#%s', $order->getRealOrderId()));
 
             $this->renderLayout();
         }
diff --git a/app/code/core/Mage/Adminhtml/controllers/Sales/TransactionsController.php b/app/code/core/Mage/Adminhtml/controllers/Sales/TransactionsController.php
index 5187b8acd41b..73b2f894af37 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Sales/TransactionsController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Sales/TransactionsController.php
@@ -79,7 +79,7 @@ public function viewAction()
         }
         $this->_title($this->__('Sales'))
             ->_title($this->__('Transactions'))
-            ->_title(sprintf("#%s", $txn->getTxnId()));
+            ->_title(sprintf('#%s', $txn->getTxnId()));
 
         $this->loadLayout()
             ->_setActiveMenu('sales/transactions')
diff --git a/app/code/core/Mage/Adminhtml/controllers/System/AccountController.php b/app/code/core/Mage/Adminhtml/controllers/System/AccountController.php
index e1c719d57006..d55ca3c70845 100644
--- a/app/code/core/Mage/Adminhtml/controllers/System/AccountController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/System/AccountController.php
@@ -43,7 +43,7 @@ public function indexAction()
     public function saveAction()
     {
         $userId = Mage::getSingleton('admin/session')->getUser()->getId();
-        $user = Mage::getModel("admin/user")->load($userId);
+        $user = Mage::getModel('admin/user')->load($userId);
 
         $user->setId($userId)
             ->setUsername($this->getRequest()->getParam('username', false))
@@ -74,7 +74,7 @@ public function saveAction()
             foreach ($result as $error) {
                 Mage::getSingleton('adminhtml/session')->addError($error);
             }
-            $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+            $this->getResponse()->setRedirect($this->getUrl('*/*/'));
             return;
         }
 
@@ -86,6 +86,6 @@ public function saveAction()
         } catch (Exception $e) {
             Mage::getSingleton('adminhtml/session')->addError(Mage::helper('adminhtml')->__('An error occurred while saving account.'));
         }
-        $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+        $this->getResponse()->setRedirect($this->getUrl('*/*/'));
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/controllers/System/Convert/GuiController.php b/app/code/core/Mage/Adminhtml/controllers/System/Convert/GuiController.php
index 53a03873d9f3..a957e1846ad3 100644
--- a/app/code/core/Mage/Adminhtml/controllers/System/Convert/GuiController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/System/Convert/GuiController.php
@@ -13,7 +13,7 @@
  * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
  */
 
-include_once "ProfileController.php";
+include_once 'ProfileController.php';
 
 /**
  * Convert GUI admin controller
diff --git a/app/code/core/Mage/Adminhtml/controllers/System/DesignController.php b/app/code/core/Mage/Adminhtml/controllers/System/DesignController.php
index 51b34e561f58..780a432dbb00 100644
--- a/app/code/core/Mage/Adminhtml/controllers/System/DesignController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/System/DesignController.php
@@ -130,7 +130,7 @@ public function deleteAction()
                     ->addError($e->getMessage());
             } catch (Exception $e) {
                 Mage::getSingleton('adminhtml/session')
-                    ->addException($e, $this->__("Cannot delete the design change."));
+                    ->addException($e, $this->__('Cannot delete the design change.'));
             }
         }
         $this->getResponse()->setRedirect($this->getUrl('*/*/'));
diff --git a/app/code/core/Mage/Adminhtml/controllers/System/StoreController.php b/app/code/core/Mage/Adminhtml/controllers/System/StoreController.php
index 87154be97c6e..07f04a182278 100644
--- a/app/code/core/Mage/Adminhtml/controllers/System/StoreController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/System/StoreController.php
@@ -117,21 +117,21 @@ public function editStoreAction()
             case 'website':
                 $itemId     = $this->getRequest()->getParam('website_id', null);
                 $model      = Mage::getModel('core/website');
-                $title      = Mage::helper('core')->__("Website");
-                $notExists  = Mage::helper('core')->__("The website does not exist.");
+                $title      = Mage::helper('core')->__('Website');
+                $notExists  = Mage::helper('core')->__('The website does not exist.');
                 $codeBase   = Mage::helper('core')->__('Before modifying the website code please make sure that it is not used in index.php.');
                 break;
             case 'group':
                 $itemId     = $this->getRequest()->getParam('group_id', null);
                 $model      = Mage::getModel('core/store_group');
-                $title      = Mage::helper('core')->__("Store");
-                $notExists  = Mage::helper('core')->__("The store does not exist");
+                $title      = Mage::helper('core')->__('Store');
+                $notExists  = Mage::helper('core')->__('The store does not exist');
                 $codeBase   = false;
                 break;
             case 'store':
                 $itemId     = $this->getRequest()->getParam('store_id', null);
                 $model      = Mage::getModel('core/store');
-                $title      = Mage::helper('core')->__("Store View");
+                $title      = Mage::helper('core')->__('Store View');
                 $notExists  = Mage::helper('core')->__("Store view doesn't exist");
                 $codeBase   = Mage::helper('core')->__('Before modifying the store view code please make sure that it is not used in index.php.');
                 break;
diff --git a/app/code/core/Mage/Adminhtml/controllers/Tax/Class/CustomerController.php b/app/code/core/Mage/Adminhtml/controllers/Tax/Class/CustomerController.php
index d86f3e6bc698..0411a7f87091 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Tax/Class/CustomerController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Tax/Class/CustomerController.php
@@ -138,7 +138,7 @@ public function deleteAction()
             $classModel->delete();
 
             $session->addSuccess(Mage::helper('tax')->__('The tax class has been deleted.'));
-            $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+            $this->getResponse()->setRedirect($this->getUrl('*/*/'));
             return ;
         } catch (Mage_Core_Exception $e) {
             $session->addError($e->getMessage());
diff --git a/app/code/core/Mage/Adminhtml/controllers/Tax/Class/ProductController.php b/app/code/core/Mage/Adminhtml/controllers/Tax/Class/ProductController.php
index ffdada2720b2..5ff6f509ea5c 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Tax/Class/ProductController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Tax/Class/ProductController.php
@@ -137,7 +137,7 @@ public function deleteAction()
             $classModel->delete();
 
             $session->addSuccess(Mage::helper('tax')->__('The tax class has been deleted.'));
-            $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+            $this->getResponse()->setRedirect($this->getUrl('*/*/'));
             return;
         } catch (Mage_Core_Exception $e) {
             $session->addError($e->getMessage());
diff --git a/app/code/core/Mage/Adminhtml/controllers/Tax/RateController.php b/app/code/core/Mage/Adminhtml/controllers/Tax/RateController.php
index 299e39c8932e..fc07f93bdd5c 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Tax/RateController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Tax/RateController.php
@@ -99,7 +99,7 @@ public function saveAction()
                 $rateModel->save();
 
                 Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('tax')->__('The tax rate has been saved.'));
-                $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+                $this->getResponse()->setRedirect($this->getUrl('*/*/'));
                 return true;
             } catch (Mage_Core_Exception $e) {
                 Mage::getSingleton('adminhtml/session')->setFormData($ratePost);
@@ -131,7 +131,7 @@ public function editAction()
         }
 
         if (!$rateModel->getId()) {
-            $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+            $this->getResponse()->setRedirect($this->getUrl('*/*/'));
             return;
         }
 
@@ -139,7 +139,7 @@ public function editAction()
             $rateModel->setTaxPostcode($rateModel->getZipFrom() . '-' . $rateModel->getZipTo());
         }
 
-        $this->_title(sprintf("%s", $rateModel->getCode()));
+        $this->_title(sprintf('%s', $rateModel->getCode()));
 
         /** @var Mage_Adminhtml_Block_Tax_Rate_Toolbar_Save $block */
         $block = $this->getLayout()->createBlock('adminhtml/tax_rate_toolbar_save');
@@ -169,7 +169,7 @@ public function deleteAction()
                     $rateModel->delete();
 
                     Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('tax')->__('The tax rate has been deleted.'));
-                    $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+                    $this->getResponse()->setRedirect($this->getUrl('*/*/'));
                     return true;
                 } catch (Mage_Core_Exception $e) {
                     Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
@@ -179,7 +179,7 @@ public function deleteAction()
                 if ($referer = $this->getRequest()->getServer('HTTP_REFERER')) {
                     $this->getResponse()->setRedirect($referer);
                 } else {
-                    $this->getResponse()->setRedirect($this->getUrl("*/*/"));
+                    $this->getResponse()->setRedirect($this->getUrl('*/*/'));
                 }
             } else {
                 Mage::getSingleton('adminhtml/session')->addError(Mage::helper('tax')->__('An error occurred while deleting this rate. Incorrect rate ID.'));
diff --git a/app/code/core/Mage/Adminhtml/controllers/Tax/RuleController.php b/app/code/core/Mage/Adminhtml/controllers/Tax/RuleController.php
index 5362ec9663f6..2740d0685a2d 100644
--- a/app/code/core/Mage/Adminhtml/controllers/Tax/RuleController.php
+++ b/app/code/core/Mage/Adminhtml/controllers/Tax/RuleController.php
@@ -79,7 +79,7 @@ public function editAction()
             $ruleModel->setData($data);
         }
 
-        $this->_title($ruleModel->getId() ? sprintf("%s", $ruleModel->getCode()) : $this->__('New Rule'));
+        $this->_title($ruleModel->getId() ? sprintf('%s', $ruleModel->getCode()) : $this->__('New Rule'));
 
         Mage::register('tax_rule', $ruleModel);
 
@@ -157,7 +157,7 @@ protected function _isValidRuleRequest($ruleModel)
 
         //Verify if a Rule already exists. If not throw an error
         if (count($existingRules) > 0) {
-            $ruleCodes = implode(",", $existingRules);
+            $ruleCodes = implode(',', $existingRules);
             $session->addError(
                 $this->_getHelperModel('tax')->__('Rules (%s) already exist for the specified Tax Rate, Customer Tax Class and Product Tax Class combinations', $ruleCodes)
             );
diff --git a/app/code/core/Mage/Api/Model/Resource/Roles/User/Collection.php b/app/code/core/Mage/Api/Model/Resource/Roles/User/Collection.php
index f8ff652c5a21..66074b75dd47 100644
--- a/app/code/core/Mage/Api/Model/Resource/Roles/User/Collection.php
+++ b/app/code/core/Mage/Api/Model/Resource/Roles/User/Collection.php
@@ -39,7 +39,7 @@ protected function _initSelect()
     {
         parent::_initSelect();
 
-        $this->getSelect()->where("user_id > 0");
+        $this->getSelect()->where('user_id > 0');
 
         return $this;
     }
diff --git a/app/code/core/Mage/Api/Model/Resource/Rules/Collection.php b/app/code/core/Mage/Api/Model/Resource/Rules/Collection.php
index d75ce75b7745..ed564251cfff 100644
--- a/app/code/core/Mage/Api/Model/Resource/Rules/Collection.php
+++ b/app/code/core/Mage/Api/Model/Resource/Rules/Collection.php
@@ -38,7 +38,7 @@ protected function _construct()
      */
     public function getByRoles($id)
     {
-        $this->getSelect()->where("role_id = ?", (int)$id);
+        $this->getSelect()->where('role_id = ?', (int)$id);
         return $this;
     }
 
diff --git a/app/code/core/Mage/Api/Model/Roles.php b/app/code/core/Mage/Api/Model/Roles.php
index d73dd218a3eb..026564883aec 100644
--- a/app/code/core/Mage/Api/Model/Roles.php
+++ b/app/code/core/Mage/Api/Model/Roles.php
@@ -134,7 +134,7 @@ protected function _buildResourcesArray(
                 }
 
                 if ($rawNodes) {
-                    $resource->addAttribute("aclpath", $resourceName);
+                    $resource->addAttribute('aclpath', $resourceName);
                 }
 
                 $resource->title = Mage::helper($module)->__((string)$resource->title);
diff --git a/app/code/core/Mage/Api/Model/Server.php b/app/code/core/Mage/Api/Model/Server.php
index 6d319bbadb57..b7444712fa45 100644
--- a/app/code/core/Mage/Api/Model/Server.php
+++ b/app/code/core/Mage/Api/Model/Server.php
@@ -25,7 +25,7 @@ class Mage_Api_Model_Server
      * Api Name by Adapter
      * @var string
      */
-    protected $_api = "";
+    protected $_api = '';
 
     /**
      * Web service adapter
diff --git a/app/code/core/Mage/Api/Model/Server/Adapter/Soap.php b/app/code/core/Mage/Api/Model/Server/Adapter/Soap.php
index a0821aadd5d5..36cafcc06e43 100644
--- a/app/code/core/Mage/Api/Model/Server/Adapter/Soap.php
+++ b/app/code/core/Mage/Api/Model/Server/Adapter/Soap.php
@@ -123,7 +123,7 @@ public function getController()
      */
     public function run()
     {
-        $apiConfigCharset = Mage::getStoreConfig("api/config/charset");
+        $apiConfigCharset = Mage::getStoreConfig('api/config/charset');
 
         if ($this->getController()->getRequest()->getParam('wsdl') !== null) {
             // Generating wsdl content from template
@@ -226,7 +226,7 @@ protected function getWsdlUrl($params = null, $withAuth = true)
 
             if ($phpAuthUser && $phpAuthPw) {
                 $wsdlUrl = sprintf(
-                    "%s://%s:%s@%s",
+                    '%s://%s:%s@%s',
                     $scheme,
                     $phpAuthUser,
                     $phpAuthPw,
@@ -260,7 +260,7 @@ protected function _instantiateServer()
             $retry = false;
             try {
                 $this->_soap = new Zend_Soap_Server(
-                    $this->getWsdlUrl(["wsdl" => 1]),
+                    $this->getWsdlUrl(['wsdl' => 1]),
                     ['encoding' => $apiConfigCharset]
                 );
             } catch (SoapFault $e) {
diff --git a/app/code/core/Mage/Api/Model/Server/Adapter/Xmlrpc.php b/app/code/core/Mage/Api/Model/Server/Adapter/Xmlrpc.php
index 92895b1d6d40..9ed16c81f415 100644
--- a/app/code/core/Mage/Api/Model/Server/Adapter/Xmlrpc.php
+++ b/app/code/core/Mage/Api/Model/Server/Adapter/Xmlrpc.php
@@ -88,7 +88,7 @@ public function getController()
      */
     public function run()
     {
-        $apiConfigCharset = Mage::getStoreConfig("api/config/charset");
+        $apiConfigCharset = Mage::getStoreConfig('api/config/charset');
 
         $this->_xmlRpc = new Zend_XmlRpc_Server();
         $this->_xmlRpc->setEncoding($apiConfigCharset)
diff --git a/app/code/core/Mage/Api/Model/Server/V2/Adapter/Soap.php b/app/code/core/Mage/Api/Model/Server/V2/Adapter/Soap.php
index f7785e3bb2f0..292f17412004 100644
--- a/app/code/core/Mage/Api/Model/Server/V2/Adapter/Soap.php
+++ b/app/code/core/Mage/Api/Model/Server/V2/Adapter/Soap.php
@@ -39,7 +39,7 @@ protected function _getWsdlConfig()
      */
     public function run()
     {
-        $apiConfigCharset = Mage::getStoreConfig("api/config/charset");
+        $apiConfigCharset = Mage::getStoreConfig('api/config/charset');
 
         if ($this->getController()->getRequest()->getParam('wsdl') !== null) {
             $this->wsdlConfig->setHandler($this->getHandler())
diff --git a/app/code/core/Mage/Api/Model/Server/Wsi/Adapter/Soap.php b/app/code/core/Mage/Api/Model/Server/Wsi/Adapter/Soap.php
index 7557cca522ce..3a6796a80b7d 100644
--- a/app/code/core/Mage/Api/Model/Server/Wsi/Adapter/Soap.php
+++ b/app/code/core/Mage/Api/Model/Server/Wsi/Adapter/Soap.php
@@ -42,7 +42,7 @@ protected function _getWsdlConfig()
      */
     public function run()
     {
-        $apiConfigCharset = Mage::getStoreConfig("api/config/charset");
+        $apiConfigCharset = Mage::getStoreConfig('api/config/charset');
 
         if ($this->getController()->getRequest()->getParam('wsdl') !== null) {
             $this->getController()->getResponse()
diff --git a/app/code/core/Mage/Api/Model/Wsdl/Config.php b/app/code/core/Mage/Api/Model/Wsdl/Config.php
index 1cf684c10e63..0ff9b2903f8b 100644
--- a/app/code/core/Mage/Api/Model/Wsdl/Config.php
+++ b/app/code/core/Mage/Api/Model/Wsdl/Config.php
@@ -120,9 +120,9 @@ public function init()
              * Exclude Mage_Api wsdl xml file because it used for previous version
              * of API wsdl declaration
              */
-            $mergeWsdl->addLoadedFile(Mage::getConfig()->getModuleDir('etc', "Mage_Api") . DS . 'wsi.xml');
+            $mergeWsdl->addLoadedFile(Mage::getConfig()->getModuleDir('etc', 'Mage_Api') . DS . 'wsi.xml');
 
-            $baseWsdlFile = Mage::getConfig()->getModuleDir('etc', "Mage_Api") . DS . 'wsi.xml';
+            $baseWsdlFile = Mage::getConfig()->getModuleDir('etc', 'Mage_Api') . DS . 'wsi.xml';
             $this->loadFile($baseWsdlFile);
             Mage::getConfig()->loadModulesConfiguration('wsi.xml', $this, $mergeWsdl);
         } else {
@@ -130,9 +130,9 @@ public function init()
              * Exclude Mage_Api wsdl xml file because it used for previous version
              * of API wsdl declaration
              */
-            $mergeWsdl->addLoadedFile(Mage::getConfig()->getModuleDir('etc', "Mage_Api") . DS . 'wsdl.xml');
+            $mergeWsdl->addLoadedFile(Mage::getConfig()->getModuleDir('etc', 'Mage_Api') . DS . 'wsdl.xml');
 
-            $baseWsdlFile = Mage::getConfig()->getModuleDir('etc', "Mage_Api") . DS . 'wsdl2.xml';
+            $baseWsdlFile = Mage::getConfig()->getModuleDir('etc', 'Mage_Api') . DS . 'wsdl2.xml';
             $this->loadFile($baseWsdlFile);
             Mage::getConfig()->loadModulesConfiguration('wsdl.xml', $this, $mergeWsdl);
         }
diff --git a/app/code/core/Mage/Api2/Model/Resource/Validator/Eav.php b/app/code/core/Mage/Api2/Model/Resource/Validator/Eav.php
index c6583ef1b793..8d5b3aee7971 100644
--- a/app/code/core/Mage/Api2/Model/Resource/Validator/Eav.php
+++ b/app/code/core/Mage/Api2/Model/Resource/Validator/Eav.php
@@ -96,7 +96,7 @@ public function __construct($options)
         }
         $this->_entity = Mage::getModel($validationConfig[$userType]['entity_model']);
         if (empty($this->_entity) || !$this->_entity instanceof Mage_Core_Model_Abstract) {
-            throw new Exception("Entity is not model.");
+            throw new Exception('Entity is not model.');
         }
 
         $this->_eavForm = Mage::getModel($this->_formPath);
diff --git a/app/code/core/Mage/Api2/Model/Server.php b/app/code/core/Mage/Api2/Model/Server.php
index 1847e81260f3..4f414a4b176c 100644
--- a/app/code/core/Mage/Api2/Model/Server.php
+++ b/app/code/core/Mage/Api2/Model/Server.php
@@ -161,8 +161,8 @@ protected function _setAuthUser(Mage_Api2_Model_Auth_User_Abstract $authUser)
     protected function _getAuthUser()
     {
         if (!$this->_authUser) {
-            throw new Exception("Mage_Api2_Model_Server::internalCall() seems to be executed "
-                . "before Mage_Api2_Model_Server::run()");
+            throw new Exception('Mage_Api2_Model_Server::internalCall() seems to be executed '
+                . 'before Mage_Api2_Model_Server::run()');
         }
         return $this->_authUser;
     }
diff --git a/app/code/core/Mage/Api2/controllers/Adminhtml/Api2/RoleController.php b/app/code/core/Mage/Api2/controllers/Adminhtml/Api2/RoleController.php
index 7c0771ade6c1..c1ef897571d1 100644
--- a/app/code/core/Mage/Api2/controllers/Adminhtml/Api2/RoleController.php
+++ b/app/code/core/Mage/Api2/controllers/Adminhtml/Api2/RoleController.php
@@ -272,7 +272,7 @@ public function deleteAction()
 
         try {
             /** @var Mage_Api2_Model_Acl_Global_Role $model */
-            $model = Mage::getModel("api2/acl_global_role");
+            $model = Mage::getModel('api2/acl_global_role');
             $model->load($id)->delete();
             $this->_getSession()->addSuccess($this->__('Role has been deleted.'));
         } catch (Mage_Core_Exception $e) {
@@ -281,7 +281,7 @@ public function deleteAction()
             $this->_getSession()->addException($e, $this->__('An error occurred while deleting the role.'));
         }
 
-        $this->_redirect("*/*/");
+        $this->_redirect('*/*/');
     }
 
     /**
@@ -316,7 +316,7 @@ public function rolesGridAction()
      */
     protected function _getUsers($id)
     {
-        if ($this->getRequest()->getParam('in_role_users') != "") {
+        if ($this->getRequest()->getParam('in_role_users') != '') {
             return $this->getRequest()->getParam('in_role_users');
         }
 
diff --git a/app/code/core/Mage/Authorizenet/Helper/Admin.php b/app/code/core/Mage/Authorizenet/Helper/Admin.php
index 32b239b3fc34..77dcbfb1abef 100644
--- a/app/code/core/Mage/Authorizenet/Helper/Admin.php
+++ b/app/code/core/Mage/Authorizenet/Helper/Admin.php
@@ -53,7 +53,7 @@ public function getSaveOrderUrlParams($controller)
     {
         $route = parent::getSaveOrderUrlParams($controller);
 
-        if ($controller === "sales_order_create" || $controller === "sales_order_edit") {
+        if ($controller === 'sales_order_create' || $controller === 'sales_order_edit') {
             $route['action'] = 'save';
             $route['controller'] = 'sales_order_create';
             $route['module'] = 'admin';
diff --git a/app/code/core/Mage/Authorizenet/Helper/Data.php b/app/code/core/Mage/Authorizenet/Helper/Data.php
index 73b77315c392..aaf36ee138f3 100644
--- a/app/code/core/Mage/Authorizenet/Helper/Data.php
+++ b/app/code/core/Mage/Authorizenet/Helper/Data.php
@@ -62,7 +62,7 @@ protected function _getUrl($route, $params = [])
     public function getSaveOrderUrlParams($controller)
     {
         $route = [];
-        if ($controller === "onepage") {
+        if ($controller === 'onepage') {
             $route['action'] = 'saveOrder';
             $route['controller'] = 'onepage';
             $route['module'] = 'checkout';
diff --git a/app/code/core/Mage/Authorizenet/Model/Directpost/Request.php b/app/code/core/Mage/Authorizenet/Model/Directpost/Request.php
index 444e4df7ffdd..7c2de8885f65 100644
--- a/app/code/core/Mage/Authorizenet/Model/Directpost/Request.php
+++ b/app/code/core/Mage/Authorizenet/Model/Directpost/Request.php
@@ -67,7 +67,7 @@ protected function _setTransactionKey($transKey)
     public function generateRequestSign($merchantApiLoginId, $merchantTransactionKey, $amount, $currencyCode, $fpSequence, $fpTimestamp)
     {
         return hash_hmac(
-            "md5",
+            'md5',
             $merchantApiLoginId . '^' .
             $fpSequence . '^' .
             $fpTimestamp . '^' .
diff --git a/app/code/core/Mage/Bundle/Block/Adminhtml/Catalog/Product/Edit/Tab/Attributes/Extend.php b/app/code/core/Mage/Bundle/Block/Adminhtml/Catalog/Product/Edit/Tab/Attributes/Extend.php
index ef3def6fa2ee..1dd2fb4edddf 100644
--- a/app/code/core/Mage/Bundle/Block/Adminhtml/Catalog/Product/Edit/Tab/Attributes/Extend.php
+++ b/app/code/core/Mage/Bundle/Block/Adminhtml/Catalog/Product/Edit/Tab/Attributes/Extend.php
@@ -71,8 +71,8 @@ public function getElementHtml()
             $html .= '<span class="next-toselect">' . $elementHtml . '</span>';
         }
         if ($this->getDisableChild() && !$this->getElement()->getReadonly()) {
-            $html .= "<script type=\"text/javascript\">
-                function " . $switchAttributeCode . "_change() {
+            $html .= '<script type="text/javascript">
+                function ' . $switchAttributeCode . "_change() {
                     if ($('" . $switchAttributeCode . "').value == '" . self::DYNAMIC . "') {
                         if ($('" . $this->getAttribute()->getAttributeCode() . "')) {
                             $('" . $this->getAttribute()->getAttributeCode() . "').disabled = true;
@@ -92,7 +92,7 @@ function " . $switchAttributeCode . "_change() {
                 && $this->getProduct()->isObjectNew()
             ) {
                 $defaultProductPrice = ($this->getDefaultProductPrice()) ? $this->getDefaultProductPrice() : "''";
-                $html .= "$('" . $this->getAttribute()->getAttributeCode() . "').value = " . $defaultProductPrice . ";";
+                $html .= "$('" . $this->getAttribute()->getAttributeCode() . "').value = " . $defaultProductPrice . ';';
             } else {
                 $html .= "$('" . $this->getAttribute()->getAttributeCode() . "').disabled = false;
                           $('" . $this->getAttribute()->getAttributeCode() . "').addClassName('required-entry');";
@@ -110,10 +110,10 @@ function " . $switchAttributeCode . "_change() {
                 && !$this->getCanEditPrice()
                 && !$this->getProduct()->isObjectNew())
             ) {
-                $html .= "$('" . $switchAttributeCode . "').observe('change', " . $switchAttributeCode . "_change);";
+                $html .= "$('" . $switchAttributeCode . "').observe('change', " . $switchAttributeCode . '_change);';
             }
-            $html .= $switchAttributeCode . "_change();
-            </script>";
+            $html .= $switchAttributeCode . '_change();
+            </script>';
         }
         return $html;
     }
diff --git a/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/Items/Renderer.php b/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/Items/Renderer.php
index 65e49b59c28c..22ae9d96f4ba 100644
--- a/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/Items/Renderer.php
+++ b/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/Items/Renderer.php
@@ -201,7 +201,7 @@ public function getValueHtml($item)
         }
         if (!$this->isChildCalculated($item)) {
             if ($attributes = $this->getSelectionAttributes($item)) {
-                $result .= " " . $this->getOrderItem()->getOrder()->formatPrice($attributes['price']);
+                $result .= ' ' . $this->getOrderItem()->getOrder()->formatPrice($attributes['price']);
             }
         }
         return $result;
diff --git a/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/View/Items/Renderer.php b/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/View/Items/Renderer.php
index 58f8390e5c00..6da0573e4a73 100644
--- a/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/View/Items/Renderer.php
+++ b/app/code/core/Mage/Bundle/Block/Adminhtml/Sales/Order/View/Items/Renderer.php
@@ -152,7 +152,7 @@ public function getValueHtml($item)
         }
         if (!$this->isChildCalculated($item)) {
             if ($attributes = $this->getSelectionAttributes($item)) {
-                $result .= " " . $this->getItem()->getOrder()->formatPrice($attributes['price']);
+                $result .= ' ' . $this->getItem()->getOrder()->formatPrice($attributes['price']);
             }
         }
         return $result;
diff --git a/app/code/core/Mage/Bundle/Block/Sales/Order/Items/Renderer.php b/app/code/core/Mage/Bundle/Block/Sales/Order/Items/Renderer.php
index 40f501cd4b48..94bcd32ccf8d 100644
--- a/app/code/core/Mage/Bundle/Block/Sales/Order/Items/Renderer.php
+++ b/app/code/core/Mage/Bundle/Block/Sales/Order/Items/Renderer.php
@@ -133,7 +133,7 @@ public function getValueHtml($item)
         if ($attributes = $this->getSelectionAttributes($item)) {
             return sprintf('%d', $attributes['qty']) . ' x ' .
                 $this->escapeHtml($item->getName()) .
-                " " . $this->getOrder()->formatPrice($attributes['price']);
+                ' ' . $this->getOrder()->formatPrice($attributes['price']);
         } else {
             return $this->escapeHtml($item->getName());
         }
diff --git a/app/code/core/Mage/Bundle/Model/Resource/Bundle.php b/app/code/core/Mage/Bundle/Model/Resource/Bundle.php
index 38e9562613db..db383b6f25da 100644
--- a/app/code/core/Mage/Bundle/Model/Resource/Bundle.php
+++ b/app/code/core/Mage/Bundle/Model/Resource/Bundle.php
@@ -32,13 +32,13 @@ class Mage_Bundle_Model_Resource_Bundle extends Mage_CatalogIndex_Model_Resource
     protected function _getSelect($productId, $columns = [])
     {
         return $this->_getReadAdapter()->select()
-            ->from(["bundle_option" => $this->getTable('bundle/option')], ['type', 'option_id'])
-            ->where("bundle_option.parent_id = ?", $productId)
-            ->where("bundle_option.required = 1")
+            ->from(['bundle_option' => $this->getTable('bundle/option')], ['type', 'option_id'])
+            ->where('bundle_option.parent_id = ?', $productId)
+            ->where('bundle_option.required = 1')
             ->joinLeft(
                 [
-                "bundle_selection" => $this->getTable('bundle/selection')],
-                "bundle_selection.option_id = bundle_option.option_id",
+                'bundle_selection' => $this->getTable('bundle/selection')],
+                'bundle_selection.option_id = bundle_option.option_id',
                 $columns
             );
     }
@@ -53,7 +53,7 @@ public function getSelectionsData($productId)
     {
         return $this->_getReadAdapter()->fetchAll($this->_getSelect(
             $productId,
-            ["*"]
+            ['*']
         ));
     }
 
diff --git a/app/code/core/Mage/Bundle/Model/Resource/Indexer/Price.php b/app/code/core/Mage/Bundle/Model/Resource/Indexer/Price.php
index d194e27bb428..9b149f29ef94 100644
--- a/app/code/core/Mage/Bundle/Model/Resource/Indexer/Price.php
+++ b/app/code/core/Mage/Bundle/Model/Resource/Indexer/Price.php
@@ -203,7 +203,7 @@ protected function _prepareBundlePriceByType($priceType, $entityIds = null)
                     '1',
                     '0'
                 )
-            ) . " > 0 AND " .
+            ) . ' > 0 AND ' .
             $write->getCheckSql(
                 $specialTo . ' IS NULL',
                 '1',
@@ -224,7 +224,7 @@ protected function _prepareBundlePriceByType($priceType, $entityIds = null)
             '0'
         );
 
-        $tierExpr       = new Zend_Db_Expr("tp.min_price");
+        $tierExpr       = new Zend_Db_Expr('tp.min_price');
 
         if ($priceType == Mage_Bundle_Model_Product_Price::PRICE_TYPE_FIXED) {
             $finalPrice = $write->getCheckSql(
@@ -248,7 +248,7 @@ protected function _prepareBundlePriceByType($priceType, $entityIds = null)
                 $finalPrice
             );
         } else {
-            $finalPrice     = new Zend_Db_Expr("0");
+            $finalPrice     = new Zend_Db_Expr('0');
             $tierPrice      = $write->getCheckSql($tierExpr . ' IS NOT NULL', '0', 'NULL');
             $groupPrice     = $write->getCheckSql($groupPriceExpr . ' > 0', $groupPriceExpr, 'NULL');
         }
@@ -329,7 +329,7 @@ protected function _calculateBundleOptionPrice()
             'MIN(io.alt_price)',
             'SUM(io.min_price)'
         ) . ' + i.price');
-        $maxPrice  = new Zend_Db_Expr("SUM(io.max_price) + i.price");
+        $maxPrice  = new Zend_Db_Expr('SUM(io.max_price) + i.price');
         $tierPrice = $write->getCheckSql(
             'MIN(i.tier_percent) IS NOT NULL',
             $write->getCheckSql(
diff --git a/app/code/core/Mage/Bundle/Model/Resource/Selection.php b/app/code/core/Mage/Bundle/Model/Resource/Selection.php
index 3d00b64258e7..c1dd98ca4fe9 100644
--- a/app/code/core/Mage/Bundle/Model/Resource/Selection.php
+++ b/app/code/core/Mage/Bundle/Model/Resource/Selection.php
@@ -48,7 +48,7 @@ public function getPriceFromIndex($productId, $qty, $storeId, $groupId)
 
         $websiteId = Mage::app()->getStore($storeId)->getWebsiteId();
 
-        $select->from(["price_index" => $this->getTable('catalogindex/price')], ['price' => 'SUM(value)'])
+        $select->from(['price_index' => $this->getTable('catalogindex/price')], ['price' => 'SUM(value)'])
             ->where('entity_id = :product_id')
             ->where('website_id = :website_id')
             ->where('customer_group_id = :customer_group')
diff --git a/app/code/core/Mage/Bundle/Model/Sales/Order/Pdf/Items/Abstract.php b/app/code/core/Mage/Bundle/Model/Sales/Order/Pdf/Items/Abstract.php
index 62cb3dfa7fcf..e5fc2e4cf09b 100644
--- a/app/code/core/Mage/Bundle/Model/Sales/Order/Pdf/Items/Abstract.php
+++ b/app/code/core/Mage/Bundle/Model/Sales/Order/Pdf/Items/Abstract.php
@@ -243,7 +243,7 @@ public function getValueHtml($item)
         if (!$this->isChildCalculated($item)) {
             $attributes = $this->getSelectionAttributes($item);
             if ($attributes) {
-                $result .= " " . strip_tags($this->getOrderItem()->getOrder()->formatPrice($attributes['price']));
+                $result .= ' ' . strip_tags($this->getOrderItem()->getOrder()->formatPrice($attributes['price']));
             }
         }
         return $result;
diff --git a/app/code/core/Mage/Bundle/sql/bundle_setup/mysql4-data-upgrade-0.1.13-0.1.14.php b/app/code/core/Mage/Bundle/sql/bundle_setup/mysql4-data-upgrade-0.1.13-0.1.14.php
index d7a2178df37f..cb2045b153ff 100644
--- a/app/code/core/Mage/Bundle/sql/bundle_setup/mysql4-data-upgrade-0.1.13-0.1.14.php
+++ b/app/code/core/Mage/Bundle/sql/bundle_setup/mysql4-data-upgrade-0.1.13-0.1.14.php
@@ -20,8 +20,8 @@
 $taxClassAttribute  = $installer->getAttribute('catalog_product', 'tax_class_id');
 
 $productTable   = $installer->getTable('catalog/product');
-$priceTypeTable = $productTable . "_" . $priceTypeAttribute['backend_type'];
-$taxClassTable  = $productTable . "_" . $taxClassAttribute['backend_type'];
+$priceTypeTable = $productTable . '_' . $priceTypeAttribute['backend_type'];
+$taxClassTable  = $productTable . '_' . $taxClassAttribute['backend_type'];
 
 $db = $installer->getConnection();
 $db->beginTransaction();
diff --git a/app/code/core/Mage/Catalog/Block/Widget/Link.php b/app/code/core/Mage/Catalog/Block/Widget/Link.php
index 393f2a7bdf6a..658bdc1829a0 100644
--- a/app/code/core/Mage/Catalog/Block/Widget/Link.php
+++ b/app/code/core/Mage/Catalog/Block/Widget/Link.php
@@ -80,9 +80,9 @@ public function getHref()
         }
 
         if ($this->_href) {
-            if (strpos($this->_href, "___store") === false) {
-                $symbol = (strpos($this->_href, "?") === false) ? "?" : "&";
-                $this->_href = $this->_href . $symbol . "___store=" . $store->getCode();
+            if (strpos($this->_href, '___store') === false) {
+                $symbol = (strpos($this->_href, '?') === false) ? '?' : '&';
+                $this->_href = $this->_href . $symbol . '___store=' . $store->getCode();
             }
         } else {
             return false;
diff --git a/app/code/core/Mage/Catalog/Helper/Category/Url/Rewrite.php b/app/code/core/Mage/Catalog/Helper/Category/Url/Rewrite.php
index c38648923e4c..c15d83e9609a 100644
--- a/app/code/core/Mage/Catalog/Helper/Category/Url/Rewrite.php
+++ b/app/code/core/Mage/Catalog/Helper/Category/Url/Rewrite.php
@@ -60,9 +60,9 @@ public function joinTableToEavCollection(Mage_Eav_Model_Entity_Collection_Abstra
             'core/url_rewrite',
             'category_id=entity_id',
             ['request_path'],
-            "{{table}}.is_system=1 AND " .
+            '{{table}}.is_system=1 AND ' .
                 "{{table}}.store_id='{$storeId}' AND " .
-                "{{table}}.category_id IS NOT NULL AND " .
+                '{{table}}.category_id IS NOT NULL AND ' .
                 "{{table}}.id_path LIKE 'category/%'",
             'left'
         );
diff --git a/app/code/core/Mage/Catalog/Helper/Data.php b/app/code/core/Mage/Catalog/Helper/Data.php
index 79b39545d28e..24ada49f41b2 100644
--- a/app/code/core/Mage/Catalog/Helper/Data.php
+++ b/app/code/core/Mage/Catalog/Helper/Data.php
@@ -424,7 +424,7 @@ public function canApplyMsrpToProductType($product)
      */
     public function getMsrpPriceMessage($product)
     {
-        $message = "";
+        $message = '';
         if ($this->canApplyMsrp($product, Mage_Catalog_Model_Product_Attribute_Source_Msrp_Type::TYPE_IN_CART)) {
             $message = $this->__('To see product price, add this item to your cart. You can always remove it later.');
         } elseif ($this->canApplyMsrp($product, Mage_Catalog_Model_Product_Attribute_Source_Msrp_Type::TYPE_BEFORE_ORDER_CONFIRM)) {
diff --git a/app/code/core/Mage/Catalog/Helper/Product.php b/app/code/core/Mage/Catalog/Helper/Product.php
index 245222cf695e..c334c99052b2 100644
--- a/app/code/core/Mage/Catalog/Helper/Product.php
+++ b/app/code/core/Mage/Catalog/Helper/Product.php
@@ -450,7 +450,7 @@ public function getProduct($productId, $store, $identifierType = null)
 
         $expectedIdType = false;
         if ($identifierType === null) {
-            if (is_string($productId) && !preg_match("/^[+-]?[1-9][0-9]*$|^0$/", $productId)) {
+            if (is_string($productId) && !preg_match('/^[+-]?[1-9][0-9]*$|^0$/', $productId)) {
                 $expectedIdType = 'sku';
             }
         }
diff --git a/app/code/core/Mage/Catalog/Model/Category/Api.php b/app/code/core/Mage/Catalog/Model/Category/Api.php
index 7ed9cb27d503..8fb3120484b4 100644
--- a/app/code/core/Mage/Catalog/Model/Category/Api.php
+++ b/app/code/core/Mage/Catalog/Model/Category/Api.php
@@ -265,7 +265,7 @@ public function create($parentId, $categoryData, $store = null)
          * Proceed with $useConfig set into category model for processing through validation
          */
         if (count($useConfig) > 0) {
-            $category->setData("use_post_data_config", $useConfig);
+            $category->setData('use_post_data_config', $useConfig);
         }
 
         try {
@@ -355,7 +355,7 @@ public function move($categoryId, $parentId, $afterId = null)
         }
 
         if (str_starts_with($parent_category->getPath(), $category->getPath())) {
-            $this->_fault('not_moved', "Operation do not allow to move a parent category to any of children category");
+            $this->_fault('not_moved', 'Operation do not allow to move a parent category to any of children category');
         }
 
         try {
diff --git a/app/code/core/Mage/Catalog/Model/Category/Attribute/Backend/Sortby.php b/app/code/core/Mage/Catalog/Model/Category/Attribute/Backend/Sortby.php
index 14fc7752f9d1..08f3277bfc1d 100644
--- a/app/code/core/Mage/Catalog/Model/Category/Attribute/Backend/Sortby.php
+++ b/app/code/core/Mage/Catalog/Model/Category/Attribute/Backend/Sortby.php
@@ -63,7 +63,7 @@ public function validate($object)
                     $available = explode(',', $available);
                 }
                 $data = (!in_array('default_sort_by', $postDataConfig)) ? $object->getData($attributeCode) :
-                       Mage::getStoreConfig("catalog/frontend/default_sort_by");
+                       Mage::getStoreConfig('catalog/frontend/default_sort_by');
                 if (!in_array($data, $available)) {
                     Mage::throwException(Mage::helper('eav')->__('Default Product Listing Sort by does not exist in Available Product Listing Sort By.'));
                 }
diff --git a/app/code/core/Mage/Catalog/Model/Convert/Adapter/Product.php b/app/code/core/Mage/Catalog/Model/Convert/Adapter/Product.php
index 9dab4c052c01..c3ab65a4e3ac 100644
--- a/app/code/core/Mage/Catalog/Model/Convert/Adapter/Product.php
+++ b/app/code/core/Mage/Catalog/Model/Convert/Adapter/Product.php
@@ -575,7 +575,7 @@ public function save()
                         unset($model);
                         $i++;
                     }
-                    $this->addException(Mage::helper('catalog')->__("Saved %d record(s)", $i));
+                    $this->addException(Mage::helper('catalog')->__('Saved %d record(s)', $i));
                 } catch (Exception $e) {
                     if (!$e instanceof Mage_Dataflow_Model_Convert_Exception) {
                         $this->addException(
diff --git a/app/code/core/Mage/Catalog/Model/Design.php b/app/code/core/Mage/Catalog/Model/Design.php
index 990db6a020d7..49007b18f801 100644
--- a/app/code/core/Mage/Catalog/Model/Design.php
+++ b/app/code/core/Mage/Catalog/Model/Design.php
@@ -162,7 +162,7 @@ protected function _isApplyDesign($design, array $date)
             return false;
         }
 
-        $designInfo = explode("/", $design);
+        $designInfo = explode('/', $design);
         if (count($designInfo) != 2) {
             return false;
         }
diff --git a/app/code/core/Mage/Catalog/Model/Product.php b/app/code/core/Mage/Catalog/Model/Product.php
index 799a44cbe2b3..0f72908b9cec 100644
--- a/app/code/core/Mage/Catalog/Model/Product.php
+++ b/app/code/core/Mage/Catalog/Model/Product.php
@@ -2069,7 +2069,7 @@ public function getReservedAttributes()
             foreach ($methods as $method) {
                 if (preg_match('/^get([A-Z]{1}.+)/', $method, $matches)) {
                     $method = $matches[1];
-                    $tmp = strtolower(preg_replace('/(.)([A-Z])/', "$1_$2", $method));
+                    $tmp = strtolower(preg_replace('/(.)([A-Z])/', '$1_$2', $method));
                     $_reserved[] = $tmp;
                 }
             }
diff --git a/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php b/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
index 7e5b29466a24..142faed31281 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
@@ -243,14 +243,14 @@ public function afterSave($object)
             }
 
             if ($storeId === 0) {
-                $image["label_use_default"] = false;
-                $image["position_use_default"] = false;
+                $image['label_use_default'] = false;
+                $image['position_use_default'] = false;
             } else {
-                if (!isset($image["label_use_default"])) {
-                    $image["label_use_default"] = null;
+                if (!isset($image['label_use_default'])) {
+                    $image['label_use_default'] = null;
                 }
-                if (!isset($image["position_use_default"])) {
-                    $image["position_use_default"] = null;
+                if (!isset($image['position_use_default'])) {
+                    $image['position_use_default'] = null;
                 }
             }
 
@@ -259,8 +259,8 @@ public function afterSave($object)
             // Add per store labels, position, disabled
             $data = [];
             $data['value_id'] = $image['value_id'];
-            $data['label']    = ($image['label'] === null || $image["label_use_default"]) ? null : $image['label'];
-            $data['position'] = ($image['position'] === null || $image["position_use_default"]) ? null : (int) $image['position'];
+            $data['label']    = ($image['label'] === null || $image['label_use_default']) ? null : $image['label'];
+            $data['position'] = ($image['position'] === null || $image['position_use_default']) ? null : (int) $image['position'];
             $data['disabled'] = (int) $image['disabled'];
             $data['store_id'] = (int) $object->getStoreId();
 
diff --git a/app/code/core/Mage/Catalog/Model/Product/Image.php b/app/code/core/Mage/Catalog/Model/Product/Image.php
index bbd30f55fe27..112d1827231c 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Image.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Image.php
@@ -248,7 +248,7 @@ protected function _getMemoryLimit()
         $memoryLimit = trim(strtoupper(ini_get('memory_limit')));
 
         if (!isset($memoryLimit[0])) {
-            $memoryLimit = "128M";
+            $memoryLimit = '128M';
         }
 
         return ini_parse_quantity($memoryLimit);
@@ -566,7 +566,7 @@ public function saveFile()
     public function getUrl()
     {
         $baseDir = Mage::getBaseDir('media');
-        $path = str_replace($baseDir . DS, "", $this->_newFile);
+        $path = str_replace($baseDir . DS, '', $this->_newFile);
         return Mage::getBaseUrl('media') . str_replace(DS, '/', $path);
     }
 
diff --git a/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php b/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
index 5b08b5ca9936..364b8c9a7c2d 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
@@ -180,7 +180,7 @@ protected function _validateUploadedFile()
                 $this->setIsValid(false);
                 $value = $this->_bytesToMbytes($this->_getUploadMaxFilesize());
                 Mage::throwException(
-                    Mage::helper('catalog')->__("The file you uploaded is larger than %s Megabytes allowed by server", $value)
+                    Mage::helper('catalog')->__('The file you uploaded is larger than %s Megabytes allowed by server', $value)
                 );
             } else {
                 switch ($this->getProcessMode()) {
@@ -434,7 +434,7 @@ public function prepareForCart()
             try {
                 Mage::helper('core/unserializeArray')->unserialize($result);
             } catch (Exception $e) {
-                Mage::throwException(Mage::helper('catalog')->__("File options format is not valid."));
+                Mage::throwException(Mage::helper('catalog')->__('File options format is not valid.'));
             }
         } else {
             /*
@@ -515,7 +515,7 @@ protected function _getOptionHtml($optionValue)
                 $sizes
             );
         } catch (Exception $e) {
-            Mage::throwException(Mage::helper('catalog')->__("File options format is not valid."));
+            Mage::throwException(Mage::helper('catalog')->__('File options format is not valid.'));
         }
     }
 
diff --git a/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php b/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php
index 5773d9f4cf06..69b722224823 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Type/Abstract.php
@@ -449,7 +449,7 @@ public function processFileQueue()
                             if (isset($queueOptions['option'])) {
                                 $queueOptions['option']->setIsValid(false);
                             }
-                            Mage::throwException(Mage::helper('catalog')->__("File upload failed"));
+                            Mage::throwException(Mage::helper('catalog')->__('File upload failed'));
                         }
                         Mage::helper('core/file_storage_database')->saveFile($dst);
                         break;
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Category.php b/app/code/core/Mage/Catalog/Model/Resource/Category.php
index c3201921c2ff..658fa1dccbdb 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Category.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Category.php
@@ -459,7 +459,7 @@ public function getChildrenAmount($category, $isActiveFlag = true)
             )
             ->joinLeft(
                 ['c' => $table],
-                "c.attribute_id = :attribute_id AND c.store_id = :store_id AND c.entity_id = m.entity_id",
+                'c.attribute_id = :attribute_id AND c.store_id = :store_id AND c.entity_id = m.entity_id',
                 []
             )
             ->where('m.path LIKE :c_path')
@@ -480,7 +480,7 @@ protected function _getIsActiveAttributeId()
                 ->getAttribute(Mage_Catalog_Model_Category::ENTITY, 'is_active')
                 ->getId();
             if (!is_int($attributeId)) {
-                Mage::throwException("Failed to find category attribute is_active");
+                Mage::throwException('Failed to find category attribute is_active');
             }
             $this->_isActiveAttributeId = $attributeId;
         }
@@ -704,7 +704,7 @@ public function getChildren($category, $recursive = true)
                 []
             )
             ->where($checkSql . ' = :scope')
-            ->order("m.position ASC");
+            ->order('m.position ASC');
 
         return $adapter->fetchCol($select, $bind);
     }
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Category/Flat.php b/app/code/core/Mage/Catalog/Model/Resource/Category/Flat.php
index 3a03e409ef51..c2c193f010d3 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Category/Flat.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Category/Flat.php
@@ -285,7 +285,7 @@ protected function _loadNodes($parentNode = null, $recursionLevel = 0, $storeId
         $urlRewrite->joinTableToSelect($select, $storeId);
 
         if ($parentPath) {
-            $select->where($_conn->quoteInto("main_table.path like ?", "$parentPath/%"));
+            $select->where($_conn->quoteInto('main_table.path like ?', "$parentPath/%"));
         }
         if ($recursionLevel != 0) {
             $levelField = $_conn->quoteIdentifier('level');
@@ -1120,7 +1120,7 @@ public function moveold($categoryId, $prevParentId, $parentId)
 
                 $update = "UPDATE {$mainStoreTable}, {$catalogCategoryTable} SET";
                 foreach ($_staticFields as $field) {
-                    $update .= " {$mainStoreTable}." . $field . "={$catalogCategoryTable}." . $field . ",";
+                    $update .= " {$mainStoreTable}." . $field . "={$catalogCategoryTable}." . $field . ',';
                 }
                 $update = substr($update, 0, -1);
                 $update .= " WHERE {$mainStoreTable}.entity_id = {$catalogCategoryTable}.entity_id AND " .
@@ -1335,7 +1335,7 @@ public function getChildren($category, $recursive = true, $isActive = true)
         $select = $this->_getReadAdapter()->select()
             ->from($maintable, 'entity_id')
             ->where('path LIKE ?', "{$category->getPath()}/%")
-            ->order($maintable . ".position ASC");
+            ->order($maintable . '.position ASC');
         if (!$recursive) {
             $select->where('level <= ?', $category->getLevel() + 1);
         }
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Category/Indexer/Product.php b/app/code/core/Mage/Catalog/Model/Resource/Category/Indexer/Product.php
index 286e83a1be5f..cc6cd8b9fb13 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Category/Indexer/Product.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Category/Indexer/Product.php
@@ -269,7 +269,7 @@ public function catalogCategorySave(Mage_Index_Model_Event $event)
             ->from(['ce' => $this->_categoryTable], ['entity_id'])
             ->joinInner(
                 ['dca' => $anchorInfo['table']],
-                "dca.entity_id=ce.entity_id AND dca.attribute_id=:attribute_id AND dca.store_id=:store_id",
+                'dca.entity_id=ce.entity_id AND dca.attribute_id=:attribute_id AND dca.store_id=:store_id',
                 []
             )
              ->where('dca.value=:e_value')
@@ -385,7 +385,7 @@ protected function _refreshNotAnchorRootCategories(?array $categoryIds = null)
                 ->joinLeft(
                     ['sv' => $visibilityInfo['table']],
                     "sv.entity_id = pw.product_id AND sv.attribute_id = {$visibilityInfo['id']}"
-                        . " AND sv.store_id = " . (int)$storeId,
+                        . ' AND sv.store_id = ' . (int)$storeId,
                     []
                 )
                 ->join(
@@ -396,7 +396,7 @@ protected function _refreshNotAnchorRootCategories(?array $categoryIds = null)
                 ->joinLeft(
                     ['ss' => $statusInfo['table']],
                     "ss.entity_id = pw.product_id AND ss.attribute_id = {$statusInfo['id']}"
-                        . " AND ss.store_id = " . (int)$storeId,
+                        . ' AND ss.store_id = ' . (int)$storeId,
                     []
                 )
                 ->where('i.product_id IS NULL')
@@ -463,7 +463,7 @@ protected function _refreshDirectRelations($categoryIds = null, $productIds = nu
             ->joinLeft(
                 ['dv' => $visibilityInfo['table']],
                 $adapter->quoteInto(
-                    "dv.entity_id=cp.product_id AND dv.attribute_id=? AND dv.store_id=0",
+                    'dv.entity_id=cp.product_id AND dv.attribute_id=? AND dv.store_id=0',
                     $visibilityInfo['id']
                 ),
                 []
@@ -471,7 +471,7 @@ protected function _refreshDirectRelations($categoryIds = null, $productIds = nu
             ->joinLeft(
                 ['sv' => $visibilityInfo['table']],
                 $adapter->quoteInto(
-                    "sv.entity_id=cp.product_id AND sv.attribute_id=? AND sv.store_id=s.store_id",
+                    'sv.entity_id=cp.product_id AND sv.attribute_id=? AND sv.store_id=s.store_id',
                     $visibilityInfo['id']
                 ),
                 ['visibility' => $adapter->getCheckSql(
@@ -713,7 +713,7 @@ protected function _refreshRootRelations($productIds)
             ->joinLeft(
                 ['sv' => $visibilityInfo['table']],
                 "sv.entity_id = pw.product_id AND sv.attribute_id = {$visibilityInfo['id']}"
-                    . " AND sv.store_id = s.store_id",
+                    . ' AND sv.store_id = s.store_id',
                 []
             )
             ->join(
@@ -1121,14 +1121,14 @@ protected function _prepareAnchorCategories($storeId, $rootPath)
             ->joinLeft(
                 ['cad' => $anchorTable],
                 $adapter->quoteInto(
-                    "cad.entity_id=ce.entity_id AND cad.attribute_id=? AND cad.store_id=0",
+                    'cad.entity_id=ce.entity_id AND cad.attribute_id=? AND cad.store_id=0',
                     $anchorAttributeId
                 ),
                 []
             )
             ->joinLeft(
                 ['cas' => $anchorTable],
-                $adapter->quoteInto("cas.entity_id=ce.entity_id AND cas.attribute_id=? AND ", $anchorAttributeId)
+                $adapter->quoteInto('cas.entity_id=ce.entity_id AND cas.attribute_id=? AND ', $anchorAttributeId)
                     . $adapter->quoteInto('cas.store_id=?', $storeId),
                 []
             )
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Collection/Abstract.php b/app/code/core/Mage/Catalog/Model/Resource/Collection/Abstract.php
index 2656a117d985..eef89b9b8ad9 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Collection/Abstract.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Collection/Abstract.php
@@ -181,7 +181,7 @@ protected function _joinAttributeToSelect($method, $attribute, $tableAlias, $con
 
             $defCondition = str_replace($tableAlias, $defAlias, $defCondition);
             $defCondition .= $adapter->quoteInto(
-                " AND " . $adapter->quoteColumnAs("$defAlias.store_id", null) . " = ?",
+                ' AND ' . $adapter->quoteColumnAs("$defAlias.store_id", null) . ' = ?',
                 $this->getDefaultStoreId()
             );
 
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Decimal.php b/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Decimal.php
index 06d4aa1a8d19..fd0a48f2f397 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Decimal.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Decimal.php
@@ -125,7 +125,7 @@ public function getCount($filter, $range)
         $select     = $this->_getSelect($filter);
         $adapter    = $this->_getReadAdapter();
 
-        $countExpr  = new Zend_Db_Expr("COUNT(*)");
+        $countExpr  = new Zend_Db_Expr('COUNT(*)');
         $rangeExpr  = new Zend_Db_Expr("FLOOR(decimal_index.value / {$range}) + 1");
 
         $select->columns([
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php b/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
index d9d7df5b4a5c..1eedf9b2469e 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php
@@ -1528,7 +1528,7 @@ public function addAttributeToSort($attribute, $dir = self::SORT_ORDER_ASC)
 
             return $this;
         } elseif ($attribute == 'is_saleable') {
-            $this->getSelect()->order("is_saleable " . $dir);
+            $this->getSelect()->order('is_saleable ' . $dir);
             return $this;
         }
 
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Product/Flat/Indexer.php b/app/code/core/Mage/Catalog/Model/Resource/Product/Flat/Indexer.php
index 751bca62d8c7..08aad3aceacc 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Product/Flat/Indexer.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Product/Flat/Indexer.php
@@ -623,7 +623,7 @@ public function prepareFlatTable($storeId)
 
         $maxIndex = Mage::getConfig()->getNode(self::XML_NODE_MAX_INDEX_COUNT);
         if (count($indexesNeed) > $maxIndex) {
-            Mage::throwException(Mage::helper('catalog')->__("The Flat Catalog module has a limit of %2\$d filterable and/or sortable attributes. Currently there are %1\$d of them. Please reduce the number of filterable/sortable attributes in order to use this module", count($indexesNeed), $maxIndex));
+            Mage::throwException(Mage::helper('catalog')->__('The Flat Catalog module has a limit of %2$d filterable and/or sortable attributes. Currently there are %1$d of them. Please reduce the number of filterable/sortable attributes in order to use this module', count($indexesNeed), $maxIndex));
         }
 
         // Process indexes to create names for them in MMDB-style and reformat to common index definition
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Configurable.php b/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Configurable.php
index 7823a08ff356..34d4ee12d57c 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Configurable.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Configurable.php
@@ -172,12 +172,12 @@ protected function _applyConfigurableOption()
         $tierPrice = $priceExpression;
         $tierRoundPriceExp = $write->getCheckSql("{$percentExpr} = 1", $roundExpr, $tierPrice);
         $tierPriceExp = $write->getCheckSql("{$tierPrice} IS NULL", '0', $tierRoundPriceExp);
-        $tierPriceColumn = $write->getCheckSql("MIN(i.tier_price) IS NOT NULL", "SUM({$tierPriceExp})", 'NULL');
+        $tierPriceColumn = $write->getCheckSql('MIN(i.tier_price) IS NOT NULL', "SUM({$tierPriceExp})", 'NULL');
 
         $groupPrice = $priceExpression;
         $groupRoundPriceExp = $write->getCheckSql("{$percentExpr} = 1", $roundExpr, $groupPrice);
         $groupPriceExp = $write->getCheckSql("{$groupPrice} IS NULL", '0', $groupRoundPriceExp);
-        $groupPriceColumn = $write->getCheckSql("MIN(i.group_price) IS NOT NULL", "SUM({$groupPriceExp})", 'NULL');
+        $groupPriceColumn = $write->getCheckSql('MIN(i.group_price) IS NOT NULL', "SUM({$groupPriceExp})", 'NULL');
 
         $select->columns([
             'price'       => $priceColumn,
diff --git a/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Default.php b/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Default.php
index 8c3e2b5f56d2..eed78fc54a35 100644
--- a/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Default.php
+++ b/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price/Default.php
@@ -403,19 +403,19 @@ protected function _applyCustomOption()
         $minPriceRound  = new Zend_Db_Expr("ROUND(i.price * ({$optPriceValue} / 100), 4)");
         $minPriceExpr   = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $minPriceRound);
         $minPriceMin    = new Zend_Db_Expr("MIN({$minPriceExpr})");
-        $minPrice       = $write->getCheckSql("MIN(o.is_require) = 1", $minPriceMin, '0');
+        $minPrice       = $write->getCheckSql('MIN(o.is_require) = 1', $minPriceMin, '0');
 
         $tierPriceRound = new Zend_Db_Expr("ROUND(i.base_tier * ({$optPriceValue} / 100), 4)");
         $tierPriceExpr  = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $tierPriceRound);
         $tierPriceMin   = new Zend_Db_Expr("MIN($tierPriceExpr)");
-        $tierPriceValue = $write->getCheckSql("MIN(o.is_require) > 0", $tierPriceMin, 0);
-        $tierPrice      = $write->getCheckSql("MIN(i.base_tier) IS NOT NULL", $tierPriceValue, "NULL");
+        $tierPriceValue = $write->getCheckSql('MIN(o.is_require) > 0', $tierPriceMin, 0);
+        $tierPrice      = $write->getCheckSql('MIN(i.base_tier) IS NOT NULL', $tierPriceValue, 'NULL');
 
         $groupPriceRound = new Zend_Db_Expr("ROUND(i.base_group_price * ({$optPriceValue} / 100), 4)");
         $groupPriceExpr  = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $groupPriceRound);
         $groupPriceMin   = new Zend_Db_Expr("MIN($groupPriceExpr)");
-        $groupPriceValue = $write->getCheckSql("MIN(o.is_require) > 0", $groupPriceMin, 0);
-        $groupPrice      = $write->getCheckSql("MIN(i.base_group_price) IS NOT NULL", $groupPriceValue, "NULL");
+        $groupPriceValue = $write->getCheckSql('MIN(o.is_require) > 0', $groupPriceMin, 0);
+        $groupPrice      = $write->getCheckSql('MIN(i.base_group_price) IS NOT NULL', $groupPriceValue, 'NULL');
 
         $maxPriceRound  = new Zend_Db_Expr("ROUND(i.price * ({$optPriceValue} / 100), 4)");
         $maxPriceExpr   = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $maxPriceRound);
@@ -478,12 +478,12 @@ protected function _applyCustomOption()
         $tierPriceRound = new Zend_Db_Expr("ROUND(i.base_tier * ({$optPriceValue} / 100), 4)");
         $tierPriceExpr  = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $tierPriceRound);
         $tierPriceValue = $write->getCheckSql("{$tierPriceExpr} > 0 AND o.is_require > 0", $tierPriceExpr, 0);
-        $tierPrice      = $write->getCheckSql("i.base_tier IS NOT NULL", $tierPriceValue, "NULL");
+        $tierPrice      = $write->getCheckSql('i.base_tier IS NOT NULL', $tierPriceValue, 'NULL');
 
         $groupPriceRound = new Zend_Db_Expr("ROUND(i.base_group_price * ({$optPriceValue} / 100), 4)");
         $groupPriceExpr  = $write->getCheckSql("{$optPriceType} = 'fixed'", $optPriceValue, $groupPriceRound);
         $groupPriceValue = $write->getCheckSql("{$groupPriceExpr} > 0 AND o.is_require > 0", $groupPriceExpr, 0);
-        $groupPrice      = $write->getCheckSql("i.base_group_price IS NOT NULL", $groupPriceValue, "NULL");
+        $groupPrice      = $write->getCheckSql('i.base_group_price IS NOT NULL', $groupPriceValue, 'NULL');
 
         $select->columns([
             'min_price'   => $minPrice,
diff --git a/app/code/core/Mage/Catalog/data/catalog_setup/data-upgrade-1.6.0.0.4-1.6.0.0.5.php b/app/code/core/Mage/Catalog/data/catalog_setup/data-upgrade-1.6.0.0.4-1.6.0.0.5.php
index 31054cd3e33f..a8716e73bbb6 100644
--- a/app/code/core/Mage/Catalog/data/catalog_setup/data-upgrade-1.6.0.0.4-1.6.0.0.5.php
+++ b/app/code/core/Mage/Catalog/data/catalog_setup/data-upgrade-1.6.0.0.4-1.6.0.0.5.php
@@ -28,7 +28,7 @@
         $attributeTable = $installer->getAttributeTable('catalog_product', $attributeCode);
         $select = $installer->getConnection()->select()
             ->from(['e' => $attributeTable])
-            ->where("e.attribute_id=?", $attribute['attribute_id'])
+            ->where('e.attribute_id=?', $attribute['attribute_id'])
             ->where('e.value LIKE "%,,%"');
         $result = $installer->getConnection()->fetchAll($select);
 
@@ -40,7 +40,7 @@
 
                     if ($replaceCnt) {
                         $installer->getConnection()
-                            ->update($attributeTable, ['value' => $row['value']], "value_id=" . $row['value_id']);
+                            ->update($attributeTable, ['value' => $row['value']], 'value_id=' . $row['value_id']);
                     }
                 }
             }
diff --git a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.13-0.7.14.php b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.13-0.7.14.php
index 59bee154ffe8..f1ad75bdbbe1 100644
--- a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.13-0.7.14.php
+++ b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.13-0.7.14.php
@@ -18,7 +18,7 @@
 
 $mediaAttributeId = (int) $installer->getAttributeId('catalog_product', 'media_gallery');
 
-$imagesAttributesIds = implode(",", [
+$imagesAttributesIds = implode(',', [
     (int) $installer->getAttributeId('catalog_product', 'small_image'),
     (int) $installer->getAttributeId('catalog_product', 'image'),
     (int) $installer->getAttributeId('catalog_product', 'thumbnail')
diff --git a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.46-0.7.47.php b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.46-0.7.47.php
index f6c712f58fa8..78ad1ea7f922 100644
--- a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.46-0.7.47.php
+++ b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.46-0.7.47.php
@@ -111,8 +111,8 @@
             ON (t_s.entity_id = t_v_default.entity_id) AND (t_s.attribute_id='{$statusAttributeId}') AND (t_s.store_id='{$storeId}')
         WHERE
             t_v_default.attribute_id='{$visibilityAttributeId}' AND t_v_default.store_id=0
-            AND (IFNULL(t_s.value, t_s_default.value)=" . Mage_Catalog_Model_Product_Status::STATUS_ENABLED . ")
-        ");
+            AND (IFNULL(t_s.value, t_s_default.value)=" . Mage_Catalog_Model_Product_Status::STATUS_ENABLED . ')
+        ');
     }
 }
 
diff --git a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.51-0.7.52.php b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.51-0.7.52.php
index 9a07d5e20ff9..803ab65522c3 100644
--- a/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.51-0.7.52.php
+++ b/app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.51-0.7.52.php
@@ -17,7 +17,7 @@
 $this->startSetup();
 
 $table = $this->getTable('catalog/category');
-$tableTmp = $table . "_tmp";
+$tableTmp = $table . '_tmp';
 $this->run("DROP TABLE IF EXISTS `{$tableTmp}`");
 
 $this->run("CREATE TABLE `{$tableTmp}` (
diff --git a/app/code/core/Mage/CatalogIndex/Model/Indexer.php b/app/code/core/Mage/CatalogIndex/Model/Indexer.php
index 9023af6f262e..fa0150836997 100644
--- a/app/code/core/Mage/CatalogIndex/Model/Indexer.php
+++ b/app/code/core/Mage/CatalogIndex/Model/Indexer.php
@@ -714,14 +714,14 @@ public function buildEntityFilter($attributes, $values, &$filteredAttributes, $p
                                             $values[$code]['from'] = $_date;
                                         }
 
-                                        $filter[$code]->where("value >= ?", $values[$code]['from']);
+                                        $filter[$code]->where('value >= ?', $values[$code]['from']);
                                     }
 
                                     if ($values[$code]['to']) {
                                         if (!is_numeric($values[$code]['to'])) {
                                             $values[$code]['to'] = date(Varien_Db_Adapter_Pdo_Mysql::TIMESTAMP_FORMAT, strtotime($values[$code]['to']));
                                         }
-                                        $filter[$code]->where("value <= ?", $values[$code]['to']);
+                                        $filter[$code]->where('value <= ?', $values[$code]['to']);
                                     }
                                 } else {
                                     $filter[$code]->where('value in (?)', $values[$code]);
diff --git a/app/code/core/Mage/CatalogIndex/Model/Resource/Aggregation.php b/app/code/core/Mage/CatalogIndex/Model/Resource/Aggregation.php
index 5ecdabcf3e9b..56a8f89cdd3c 100644
--- a/app/code/core/Mage/CatalogIndex/Model/Resource/Aggregation.php
+++ b/app/code/core/Mage/CatalogIndex/Model/Resource/Aggregation.php
@@ -213,7 +213,7 @@ protected function _addTags($tags)
             foreach ($tags as $index => $tag) {
                 $tags[$index] = $this->_getWriteAdapter()->quote($tag);
             }
-            $query = "INSERT INTO `{$this->_tagTable}` (tag_code) VALUES (" . implode('),(', $tags) . ")";
+            $query = "INSERT INTO `{$this->_tagTable}` (tag_code) VALUES (" . implode('),(', $tags) . ')';
             $this->_getWriteAdapter()->query($query);
         } else {
             $this->_getWriteAdapter()->insert($this->_tagTable, [
diff --git a/app/code/core/Mage/CatalogIndex/Model/Resource/Data/Abstract.php b/app/code/core/Mage/CatalogIndex/Model/Resource/Data/Abstract.php
index 53dbfb59cd8a..d230138cc6a7 100644
--- a/app/code/core/Mage/CatalogIndex/Model/Resource/Data/Abstract.php
+++ b/app/code/core/Mage/CatalogIndex/Model/Resource/Data/Abstract.php
@@ -84,7 +84,7 @@ public function getAttributeData($products, $attributes, $store)
         foreach ($suffixes as $suffix) {
             $tableName = "{$this->getTable('catalog/product')}_{$suffix}";
             $condition = "product.entity_id = c.entity_id AND c.store_id = {$store} AND c.attribute_id = d.attribute_id";
-            $defaultCondition = "product.entity_id = d.entity_id AND d.store_id = 0";
+            $defaultCondition = 'product.entity_id = d.entity_id AND d.store_id = 0';
             $fields = [
                 'entity_id',
                 'type_id',
@@ -121,9 +121,9 @@ public function getAttributeData($products, $attributes, $store)
      */
     public function fetchLinkInformation($store, $table, $idField, $whereField, $id, $additionalWheres = [])
     {
-        $idsConditionSymbol = "= ?";
+        $idsConditionSymbol = '= ?';
         if (is_array($id)) {
-            $idsConditionSymbol = "in (?)";
+            $idsConditionSymbol = 'in (?)';
         }
 
         $select = $this->_getReadAdapter()->select();
@@ -210,7 +210,7 @@ public function getTierPrices($products, $website)
             'c.value',
             'c.all_groups',
         ];
-        $condition = "product.entity_id = c.entity_id";
+        $condition = 'product.entity_id = c.entity_id';
 
         $select = $this->_getReadAdapter()->select()
             ->from(['product' => $this->getTable('catalog/product')], $fields)
diff --git a/app/code/core/Mage/CatalogIndex/Model/Resource/Indexer.php b/app/code/core/Mage/CatalogIndex/Model/Resource/Indexer.php
index 47cbb6a4a2a5..3d7ccd361f89 100644
--- a/app/code/core/Mage/CatalogIndex/Model/Resource/Indexer.php
+++ b/app/code/core/Mage/CatalogIndex/Model/Resource/Indexer.php
@@ -150,7 +150,7 @@ public function clear(
                 $this->_getWriteAdapter()->query($query);
             } elseif (is_array($variable) && count($variable)) {
                 $query  = "DELETE FROM {$this->getTable($table)} WHERE ";
-                $query .= $this->_getWriteAdapter()->quoteInto("attribute_id in (?)", $variable);
+                $query .= $this->_getWriteAdapter()->quoteInto('attribute_id in (?)', $variable);
                 if ($suffixToInsert) {
                     $query .= " AND {$suffixToInsert}";
                 }
@@ -638,7 +638,7 @@ public function updateCatalogProductFlat($storeId, $productIds = null, $tableNam
             $select = $this->_getWriteAdapter()->select()
                 ->join(
                     ['p' => $this->getTable('catalogindex/price')],
-                    "`e`.`entity_id`=`p`.`entity_id`"
+                    '`e`.`entity_id`=`p`.`entity_id`'
                         . " AND `p`.`attribute_id`={$priceAttribute}"
                         . " AND `p`.`customer_group_id`={$group->getId()}"
                         . " AND `p`.`website_id`={$websiteId}",
@@ -651,7 +651,7 @@ public function updateCatalogProductFlat($storeId, $productIds = null, $tableNam
             if ($productIds instanceof Mage_Catalog_Model_Product_Condition_Interface) {
                 $select->where('e.entity_id IN (' . $productIds->getIdsSelect($this->_getWriteAdapter())->__toString() . ')');
             } elseif (!is_null($productIds)) {
-                $select->where("e.entity_id IN(?)", $productIds);
+                $select->where('e.entity_id IN(?)', $productIds);
             }
 
             $sql = $select->crossUpdateFromSelect(['e' => $tableName]);
@@ -664,7 +664,7 @@ public function updateCatalogProductFlat($storeId, $productIds = null, $tableNam
                 $select = $this->_getWriteAdapter()->select()
                     ->join(
                         ['p' => $this->getTable('catalogindex/price')],
-                        "`e`.`child_id`=`p`.`entity_id`"
+                        '`e`.`child_id`=`p`.`entity_id`'
                             . " AND `p`.`attribute_id`={$priceAttribute}"
                             . " AND `p`.`customer_group_id`={$group->getId()}"
                             . " AND `p`.`website_id`={$websiteId}",
@@ -675,7 +675,7 @@ public function updateCatalogProductFlat($storeId, $productIds = null, $tableNam
                 if ($productIds instanceof Mage_Catalog_Model_Product_Condition_Interface) {
                     $select->where('e.child_id IN (' . $productIds->getIdsSelect($this->_getWriteAdapter())->__toString() . ')');
                 } elseif (!is_null($productIds)) {
-                    $select->where("e.child_id IN(?)", $productIds);
+                    $select->where('e.child_id IN(?)', $productIds);
                 }
 
                 $sql = $select->crossUpdateFromSelect(['e' => $tableName]);
diff --git a/app/code/core/Mage/CatalogIndex/Model/Resource/Price.php b/app/code/core/Mage/CatalogIndex/Model/Resource/Price.php
index a09414b0d19b..21ce51840e31 100644
--- a/app/code/core/Mage/CatalogIndex/Model/Resource/Price.php
+++ b/app/code/core/Mage/CatalogIndex/Model/Resource/Price.php
@@ -106,7 +106,7 @@ public function getMaxValue($attribute, $entitySelect)
         }
 
         $select
-            ->columns("MAX(price_table.value" . implode('', $response->getAdditionalCalculations()) . ")")
+            ->columns('MAX(price_table.value' . implode('', $response->getAdditionalCalculations()) . ')')
             ->where('price_table.website_id = ?', $this->getWebsiteId())
             ->where('price_table.attribute_id = ?', $attribute->getId());
 
@@ -142,7 +142,7 @@ public function getCount($range, $attribute, $entitySelect)
             Mage::dispatchEvent('catalogindex_prepare_price_select', $args);
         }
 
-        $fields = ['count' => 'COUNT(DISTINCT price_table.entity_id)', 'range' => "FLOOR(((price_table.value" . implode('', $response->getAdditionalCalculations()) . ")*{$this->getRate()})/{$range})+1"];
+        $fields = ['count' => 'COUNT(DISTINCT price_table.entity_id)', 'range' => 'FLOOR(((price_table.value' . implode('', $response->getAdditionalCalculations()) . ")*{$this->getRate()})/{$range})+1"];
 
         $select->columns($fields)
             ->group('range')
@@ -257,7 +257,7 @@ public function getMinimalPrices($ids)
         $select = $this->_getReadAdapter()->select();
         $select->from(
             ['price_table' => $this->getTable('catalogindex/minimal_price')],
-            ['price_table.entity_id', 'value' => "(price_table.value)", 'tax_class_id' => '(price_table.tax_class_id)']
+            ['price_table.entity_id', 'value' => '(price_table.value)', 'tax_class_id' => '(price_table.tax_class_id)']
         )
             ->where('price_table.entity_id in (?)', $ids)
             ->where('price_table.website_id = ?', $this->getWebsiteId())
diff --git a/app/code/core/Mage/CatalogRule/Model/Action/Index/Refresh.php b/app/code/core/Mage/CatalogRule/Model/Action/Index/Refresh.php
index 8503c2f906b1..5172a163e60d 100644
--- a/app/code/core/Mage/CatalogRule/Model/Action/Index/Refresh.php
+++ b/app/code/core/Mage/CatalogRule/Model/Action/Index/Refresh.php
@@ -540,12 +540,12 @@ protected function _prepareIndexSelect(Mage_Core_Model_Website $website, $time)
                     'earliest_end_date'     => 'earliest_end_date',
                 ]
             )
-            ->where(new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . " >= from_time"))
+            ->where(new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . ' >= from_time'))
             ->where(
                 $this->_connection->getCheckSql(
                     new Zend_Db_Expr('to_time = 0'),
                     new Zend_Db_Expr(1),
-                    new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . " <= to_time")
+                    new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . ' <= to_time')
                 )
             )
             ->group(['customer_group_id', 'product_id', 'dates.rule_date', 'website_id']);
diff --git a/app/code/core/Mage/CatalogRule/sql/catalogrule_setup/mysql4-upgrade-0.7.1-0.7.2.php b/app/code/core/Mage/CatalogRule/sql/catalogrule_setup/mysql4-upgrade-0.7.1-0.7.2.php
index 532382b0c118..6bec3f765ec6 100644
--- a/app/code/core/Mage/CatalogRule/sql/catalogrule_setup/mysql4-upgrade-0.7.1-0.7.2.php
+++ b/app/code/core/Mage/CatalogRule/sql/catalogrule_setup/mysql4-upgrade-0.7.1-0.7.2.php
@@ -35,7 +35,7 @@
             }
         }
 
-        $conn->update($ruleTable, ['website_ids' => implode(',', array_keys($websiteIds))], "rule_id=" . $r['rule_id']);
+        $conn->update($ruleTable, ['website_ids' => implode(',', array_keys($websiteIds))], 'rule_id=' . $r['rule_id']);
     }
     $conn->dropColumn($ruleTable, 'store_ids');
 }
@@ -55,9 +55,9 @@
         $websiteId = $websites[$r['store_id']];
         $key = $r['from_time'] . '|' . $r['to_time'] . '|' . $websiteId . '|' . $r['customer_group_id'] . '|' . $r['product_id'] . '|' . $r['sort_order'];
         if (isset($unique[$key])) {
-            $conn->delete($ruleProductTable, $conn->quoteInto("rule_product_id=?", $r['rule_product_id']));
+            $conn->delete($ruleProductTable, $conn->quoteInto('rule_product_id=?', $r['rule_product_id']));
         } else {
-            $conn->update($ruleProductTable, ['website_id' => $websiteId], "rule_product_id=" . $r['rule_product_id']);
+            $conn->update($ruleProductTable, ['website_id' => $websiteId], 'rule_product_id=' . $r['rule_product_id']);
             $unique[$key] = true;
         }
     }
diff --git a/app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php b/app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php
index 2e0619b51213..a501404c9af2 100644
--- a/app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php
+++ b/app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php
@@ -224,7 +224,7 @@ public function getAttributeYesNoElement($attribute)
             ->setName($name)
             ->setId($attribute->getAttributeCode())
             ->setTitle($this->getAttributeLabel($attribute))
-            ->setExtraParams("")
+            ->setExtraParams('')
             ->setValue($this->getAttributeValue($attribute))
             ->setOptions($options)
             ->getHtml();
diff --git a/app/code/core/Mage/CatalogSearch/Model/Resource/Fulltext.php b/app/code/core/Mage/CatalogSearch/Model/Resource/Fulltext.php
index 6c78488d8708..c958c6874d9f 100644
--- a/app/code/core/Mage/CatalogSearch/Model/Resource/Fulltext.php
+++ b/app/code/core/Mage/CatalogSearch/Model/Resource/Fulltext.php
@@ -359,7 +359,7 @@ public function prepareResult($object, $queryText, $query)
             )
             ->where($mainTableAlias . '.store_id = ?', (int)$query->getStoreId());
 
-        $where = "";
+        $where = '';
         if ($searchType == Mage_CatalogSearch_Model_Fulltext::SEARCH_TYPE_FULLTEXT
             || $searchType == Mage_CatalogSearch_Model_Fulltext::SEARCH_TYPE_COMBINE
         ) {
diff --git a/app/code/core/Mage/CatalogSearch/Model/Resource/Helper/Mysql4.php b/app/code/core/Mage/CatalogSearch/Model/Resource/Helper/Mysql4.php
index 4a37b43b2b22..3e98281efd74 100644
--- a/app/code/core/Mage/CatalogSearch/Model/Resource/Helper/Mysql4.php
+++ b/app/code/core/Mage/CatalogSearch/Model/Resource/Helper/Mysql4.php
@@ -58,7 +58,7 @@ public function prepareTerms($str, $maxWordLength = 0)
             '('       => '(',
             ')'       => ')'
         ];
-        $words = [0 => ""];
+        $words = [0 => ''];
         $terms = [];
         preg_match_all('/([\(\)]|[\"\'][^"\']*[\"\']|[^\s\"\(\)]*)/uis', $str, $matches);
         $isOpenBracket = 0;
@@ -85,9 +85,9 @@ public function prepareTerms($str, $maxWordLength = 0)
             }
         }
         if ($isOpenBracket > 0) {
-            $words[] = sprintf("%')" . $isOpenBracket . "s", '');
+            $words[] = sprintf("%')" . $isOpenBracket . 's', '');
         } elseif ($isOpenBracket < 0) {
-            $words[0] = sprintf("%'(" . $isOpenBracket . "s", '');
+            $words[0] = sprintf("%'(" . $isOpenBracket . 's', '');
         }
         if ($maxWordLength && count($terms) > $maxWordLength) {
             $terms = array_slice($terms, 0, $maxWordLength);
diff --git a/app/code/core/Mage/Centinel/Model/Api/Client.php b/app/code/core/Mage/Centinel/Model/Api/Client.php
index 408bd64c24b2..b173b4a8d91a 100644
--- a/app/code/core/Mage/Centinel/Model/Api/Client.php
+++ b/app/code/core/Mage/Centinel/Model/Api/Client.php
@@ -29,7 +29,7 @@ class Mage_Centinel_Model_Api_Client extends CentinelClient
     public function sendHttp($url, $connectTimeout, $timeout)
     {
         // verify that the URL uses a supported protocol.
-        if ((strpos($url, "http://") === 0) || (strpos($url, "https://") === 0)) {
+        if ((strpos($url, 'http://') === 0) || (strpos($url, 'https://') === 0)) {
             //Construct the payload to POST to the url.
             $data = $this->getRequestXml();
 
@@ -57,7 +57,7 @@ public function sendHttp($url, $connectTimeout, $timeout)
             }
 
             // Assert that we received an expected Centinel Message in reponse.
-            if (strpos($result, "<CardinalMPI>") === false) {
+            if (strpos($result, '<CardinalMPI>') === false) {
                 $result = $this->setErrorResponse(CENTINEL_ERROR_CODE_8010, CENTINEL_ERROR_CODE_8010_DESC);
             }
         } else {
diff --git a/app/code/core/Mage/Checkout/Model/Api/Resource.php b/app/code/core/Mage/Checkout/Model/Api/Resource.php
index 510c821ae51b..92751f397f2f 100644
--- a/app/code/core/Mage/Checkout/Model/Api/Resource.php
+++ b/app/code/core/Mage/Checkout/Model/Api/Resource.php
@@ -103,7 +103,7 @@ protected function _getStoreId($store = null)
     protected function _getQuote($quoteId, $store = null)
     {
         /** @var Mage_Sales_Model_Quote $quote */
-        $quote = Mage::getModel("sales/quote");
+        $quote = Mage::getModel('sales/quote');
 
         if (!(is_string($store) || is_int($store))) {
             $quote->loadByIdWithoutStore($quoteId);
diff --git a/app/code/core/Mage/Checkout/Model/Api/Resource/Product.php b/app/code/core/Mage/Checkout/Model/Api/Resource/Product.php
index e8648f848db9..52491f425817 100644
--- a/app/code/core/Mage/Checkout/Model/Api/Resource/Product.php
+++ b/app/code/core/Mage/Checkout/Model/Api/Resource/Product.php
@@ -114,7 +114,7 @@ protected function _getQuoteItemByProduct(
         }
 
         if (is_null($item)) {
-            $item = Mage::getModel("sales/quote_item");
+            $item = Mage::getModel('sales/quote_item');
         }
 
         return $item;
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Api.php
index 8a59d5114f73..4cb3d233f713 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Api.php
@@ -23,7 +23,7 @@ class Mage_Checkout_Model_Cart_Api extends Mage_Checkout_Model_Api_Resource
 {
     public function __construct()
     {
-        $this->_storeIdSessionField = "cart_store_id";
+        $this->_storeIdSessionField = 'cart_store_id';
         $this->_attributesMap['quote'] = ['quote_id' => 'entity_id'];
         $this->_attributesMap['quote_customer'] = ['customer_id' => 'entity_id'];
         $this->_attributesMap['quote_address'] = ['address_id' => 'entity_id'];
@@ -104,8 +104,8 @@ public function totals($quoteId, $store = null)
         $totalsResult = [];
         foreach ($totals as $total) {
             $totalsResult[] = [
-                "title" => $total->getTitle(),
-                "amount" => $total->getValue()
+                'title' => $total->getTitle(),
+                'amount' => $total->getValue()
             ];
         }
         return $totalsResult;
@@ -140,7 +140,7 @@ public function createOrder($quoteId, $store = null, $agreements = null)
         }
 
         /** @var Mage_Checkout_Model_Api_Resource_Customer $customerResource */
-        $customerResource = Mage::getModel("checkout/api_resource_customer");
+        $customerResource = Mage::getModel('checkout/api_resource_customer');
         $isNewCustomer = $customerResource->prepareCustomerForQuote($quote);
 
         try {
@@ -200,7 +200,7 @@ public function licenseAgreement($quoteId, $store = null)
 
             foreach ($agreementsCollection as $_a) {
                 /** @var Mage_Checkout_Model_Agreement $_a */
-                $agreements[] = $this->_getAttributes($_a, "quote_agreement");
+                $agreements[] = $this->_getAttributes($_a, 'quote_agreement');
             }
         }
 
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Coupon/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Coupon/Api.php
index 839ed8a44469..b181a09a1c91 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Coupon/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Coupon/Api.php
@@ -80,7 +80,7 @@ protected function _applyCoupon($quoteId, $couponCode, $store = null)
                 ->collectTotals()
                 ->save();
         } catch (Exception $e) {
-            $this->_fault("cannot_apply_coupon_code", $e->getMessage());
+            $this->_fault('cannot_apply_coupon_code', $e->getMessage());
         }
 
         if ($couponCode) {
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Customer/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Customer/Api.php
index 86c85cdf01de..2c97e11d13e3 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Customer/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Customer/Api.php
@@ -23,7 +23,7 @@ class Mage_Checkout_Model_Cart_Customer_Api extends Mage_Checkout_Model_Api_Reso
 {
     public function __construct()
     {
-        $this->_storeIdSessionField = "cart_store_id";
+        $this->_storeIdSessionField = 'cart_store_id';
 
         $this->_attributesMap['quote'] = ['quote_id' => 'entity_id'];
         $this->_attributesMap['quote_customer'] = ['customer_id' => 'entity_id'];
@@ -103,7 +103,7 @@ public function setAddresses($quoteId, $customerAddressData, $store = null)
 
         foreach ($customerAddressData as $addressItem) {
             /** @var Mage_Sales_Model_Quote_Address $address */
-            $address = Mage::getModel("sales/quote_address");
+            $address = Mage::getModel('sales/quote_address');
             $addressMode = $addressItem['mode'];
             unset($addressItem['mode']);
 
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php
index d858dee62468..8e51bf40f7d6 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php
@@ -136,7 +136,7 @@ public function setPaymentMethod($quoteId, $paymentData, $store = null)
         $paymentData = $this->_preparePaymentData($paymentData);
 
         if (empty($paymentData)) {
-            $this->_fault("payment_method_empty");
+            $this->_fault('payment_method_empty');
         }
 
         if ($quote->isVirtual()) {
@@ -171,7 +171,7 @@ public function setPaymentMethod($quoteId, $paymentData, $store = null)
                         || $method->getCode() == 'free'
                         || ($quote->hasRecurringItems() && $method->canManageRecurringProfiles())))
                 ) {
-                    $this->_fault("method_not_allowed");
+                    $this->_fault('method_not_allowed');
                 }
             }
         }
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Product/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Product/Api.php
index dfd589b6c053..58f67f790b30 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Product/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Product/Api.php
@@ -53,11 +53,11 @@ public function add($quoteId, $productsData, $store = null)
         $errors = [];
         foreach ($productsData as $productItem) {
             if (isset($productItem['product_id'])) {
-                $productByItem = $this->_getProduct($productItem['product_id'], $store, "id");
+                $productByItem = $this->_getProduct($productItem['product_id'], $store, 'id');
             } elseif (isset($productItem['sku'])) {
-                $productByItem = $this->_getProduct($productItem['sku'], $store, "sku");
+                $productByItem = $this->_getProduct($productItem['sku'], $store, 'sku');
             } else {
-                $errors[] = Mage::helper('checkout')->__("One item of products do not have identifier or sku");
+                $errors[] = Mage::helper('checkout')->__('One item of products do not have identifier or sku');
                 continue;
             }
 
@@ -73,13 +73,13 @@ public function add($quoteId, $productsData, $store = null)
         }
 
         if (!empty($errors)) {
-            $this->_fault("add_product_fault", implode(PHP_EOL, $errors));
+            $this->_fault('add_product_fault', implode(PHP_EOL, $errors));
         }
 
         try {
             $quote->collectTotals()->save();
         } catch (Exception $e) {
-            $this->_fault("add_product_quote_save_fault", $e->getMessage());
+            $this->_fault('add_product_quote_save_fault', $e->getMessage());
         }
 
         return true;
@@ -106,11 +106,11 @@ public function update($quoteId, $productsData, $store = null)
         $errors = [];
         foreach ($productsData as $productItem) {
             if (isset($productItem['product_id'])) {
-                $productByItem = $this->_getProduct($productItem['product_id'], $store, "id");
+                $productByItem = $this->_getProduct($productItem['product_id'], $store, 'id');
             } elseif (isset($productItem['sku'])) {
-                $productByItem = $this->_getProduct($productItem['sku'], $store, "sku");
+                $productByItem = $this->_getProduct($productItem['sku'], $store, 'sku');
             } else {
-                $errors[] = Mage::helper('checkout')->__("One item of products do not have identifier or sku");
+                $errors[] = Mage::helper('checkout')->__('One item of products do not have identifier or sku');
                 continue;
             }
 
@@ -120,7 +120,7 @@ public function update($quoteId, $productsData, $store = null)
                 $this->_getProductRequest($productItem)
             );
             if (is_null($quoteItem->getId())) {
-                $errors[] = Mage::helper('checkout')->__("One item of products is not belong any of quote item");
+                $errors[] = Mage::helper('checkout')->__('One item of products is not belong any of quote item');
                 continue;
             }
 
@@ -130,13 +130,13 @@ public function update($quoteId, $productsData, $store = null)
         }
 
         if (!empty($errors)) {
-            $this->_fault("update_product_fault", implode(PHP_EOL, $errors));
+            $this->_fault('update_product_fault', implode(PHP_EOL, $errors));
         }
 
         try {
             $quote->collectTotals()->save();
         } catch (Exception $e) {
-            $this->_fault("update_product_quote_save_fault", $e->getMessage());
+            $this->_fault('update_product_quote_save_fault', $e->getMessage());
         }
 
         return true;
@@ -163,11 +163,11 @@ public function remove($quoteId, $productsData, $store = null)
         $errors = [];
         foreach ($productsData as $productItem) {
             if (isset($productItem['product_id'])) {
-                $productByItem = $this->_getProduct($productItem['product_id'], $store, "id");
+                $productByItem = $this->_getProduct($productItem['product_id'], $store, 'id');
             } elseif (isset($productItem['sku'])) {
-                $productByItem = $this->_getProduct($productItem['sku'], $store, "sku");
+                $productByItem = $this->_getProduct($productItem['sku'], $store, 'sku');
             } else {
-                $errors[] = Mage::helper('checkout')->__("One item of products do not have identifier or sku");
+                $errors[] = Mage::helper('checkout')->__('One item of products do not have identifier or sku');
                 continue;
             }
 
@@ -178,7 +178,7 @@ public function remove($quoteId, $productsData, $store = null)
                     $this->_getProductRequest($productItem)
                 );
                 if (is_null($quoteItem->getId())) {
-                    $errors[] = Mage::helper('checkout')->__("One item of products is not belong any of quote item");
+                    $errors[] = Mage::helper('checkout')->__('One item of products is not belong any of quote item');
                     continue;
                 }
                 $quote->removeItem($quoteItem->getId());
@@ -188,13 +188,13 @@ public function remove($quoteId, $productsData, $store = null)
         }
 
         if (!empty($errors)) {
-            $this->_fault("remove_product_fault", implode(PHP_EOL, $errors));
+            $this->_fault('remove_product_fault', implode(PHP_EOL, $errors));
         }
 
         try {
             $quote->collectTotals()->save();
         } catch (Exception $e) {
-            $this->_fault("remove_product_quote_save_fault", $e->getMessage());
+            $this->_fault('remove_product_quote_save_fault', $e->getMessage());
         }
 
         return true;
@@ -273,11 +273,11 @@ public function moveToCustomerQuote($quoteId, $productsData, $store = null)
         $errors = [];
         foreach ($productsData as $key => $productItem) {
             if (isset($productItem['product_id'])) {
-                $productByItem = $this->_getProduct($productItem['product_id'], $store, "id");
+                $productByItem = $this->_getProduct($productItem['product_id'], $store, 'id');
             } elseif (isset($productItem['sku'])) {
-                $productByItem = $this->_getProduct($productItem['sku'], $store, "sku");
+                $productByItem = $this->_getProduct($productItem['sku'], $store, 'sku');
             } else {
-                $errors[] = Mage::helper('checkout')->__("One item of products do not have identifier or sku");
+                $errors[] = Mage::helper('checkout')->__('One item of products do not have identifier or sku');
                 continue;
             }
 
@@ -294,7 +294,7 @@ public function moveToCustomerQuote($quoteId, $productsData, $store = null)
                     $quote->removeItem($quoteItem->getId());
                     unset($productsData[$key]);
                 } else {
-                    $errors[] = Mage::helper('checkout')->__("One item of products is not belong any of quote item");
+                    $errors[] = Mage::helper('checkout')->__('One item of products is not belong any of quote item');
                 }
             } catch (Mage_Core_Exception $e) {
                 $errors[] = $e->getMessage();
@@ -314,7 +314,7 @@ public function moveToCustomerQuote($quoteId, $productsData, $store = null)
                 ->collectTotals()
                 ->save();
         } catch (Exception $e) {
-            $this->_fault("product_move_quote_save_fault", $e->getMessage());
+            $this->_fault('product_move_quote_save_fault', $e->getMessage());
         }
 
         return true;
diff --git a/app/code/core/Mage/Checkout/Model/Cart/Shipping/Api.php b/app/code/core/Mage/Checkout/Model/Cart/Shipping/Api.php
index ecc43b506e15..877228a7b1e4 100644
--- a/app/code/core/Mage/Checkout/Model/Cart/Shipping/Api.php
+++ b/app/code/core/Mage/Checkout/Model/Cart/Shipping/Api.php
@@ -40,7 +40,7 @@ public function setShippingMethod($quoteId, $shippingMethod, $store = null)
 
         $quoteShippingAddress = $quote->getShippingAddress();
         if (is_null($quoteShippingAddress->getId())) {
-            $this->_fault("shipping_address_is_not_set");
+            $this->_fault('shipping_address_is_not_set');
         }
 
         $rate = $quote->getShippingAddress()->collectShippingRates()->getShippingRateByCode($shippingMethod);
@@ -71,7 +71,7 @@ public function getShippingMethodsList($quoteId, $store = null)
 
         $quoteShippingAddress = $quote->getShippingAddress();
         if (is_null($quoteShippingAddress->getId())) {
-            $this->_fault("shipping_address_is_not_set");
+            $this->_fault('shipping_address_is_not_set');
         }
 
         try {
@@ -86,7 +86,7 @@ public function getShippingMethodsList($quoteId, $store = null)
                 }
 
                 foreach ($rates as $rate) {
-                    $rateItem = $this->_getAttributes($rate, "quote_shipping_rate");
+                    $rateItem = $this->_getAttributes($rate, 'quote_shipping_rate');
                     $rateItem['carrierName'] = $carrierName;
                     $ratesResult[] = $rateItem;
                     unset($rateItem);
diff --git a/app/code/core/Mage/Checkout/controllers/OnepageController.php b/app/code/core/Mage/Checkout/controllers/OnepageController.php
index 68af5285672f..50fd294b5c54 100644
--- a/app/code/core/Mage/Checkout/controllers/OnepageController.php
+++ b/app/code/core/Mage/Checkout/controllers/OnepageController.php
@@ -521,7 +521,7 @@ protected function _getOrder()
         if (is_null($this->_order)) {
             $this->_order = Mage::getModel('sales/order')->load($this->getOnepage()->getQuote()->getId(), 'quote_id');
             if (!$this->_order->getId()) {
-                throw new Mage_Payment_Model_Info_Exception(Mage::helper('core')->__("Can not create invoice. Order was not found."));
+                throw new Mage_Payment_Model_Info_Exception(Mage::helper('core')->__('Can not create invoice. Order was not found.'));
             }
         }
         return $this->_order;
diff --git a/app/code/core/Mage/Cms/data/cms_setup/data-install-1.6.0.0.php b/app/code/core/Mage/Cms/data/cms_setup/data-install-1.6.0.0.php
index 033bd3ae90d5..d3b6a989cd47 100644
--- a/app/code/core/Mage/Cms/data/cms_setup/data-install-1.6.0.0.php
+++ b/app/code/core/Mage/Cms/data/cms_setup/data-install-1.6.0.0.php
@@ -17,11 +17,11 @@
     [
         'title'         => 'Footer Links',
         'identifier'    => 'footer_links',
-        'content'       => "
+        'content'       => '
 <ul>
-    <li><a href=\"{{store direct_url=\"about-magento-demo-store\"}}\">About Us</a></li>
-    <li class=\"last\"><a href=\"{{store direct_url=\"customer-service\"}}\">Customer Service</a></li>
-</ul>",
+    <li><a href="{{store direct_url="about-magento-demo-store"}}">About Us</a></li>
+    <li class="last"><a href="{{store direct_url="customer-service"}}">Customer Service</a></li>
+</ul>',
         'is_active'     => 1,
         'stores'        => 0
     ]
@@ -35,12 +35,12 @@
         'meta_description'
                         => 'Page description',
         'identifier'    => 'no-route',
-        'content'       => "
-<div class=\"page-title\"><h1>Whoops, our bad...</h1></div>
+        'content'       => '
+<div class="page-title"><h1>Whoops, our bad...</h1></div>
 <dl>
     <dt>The page you requested was not found, and we have a fine guess why.</dt>
     <dd>
-        <ul class=\"disc\">
+        <ul class="disc">
             <li>If you typed the URL directly, please make sure the spelling is correct.</li>
             <li>If you clicked on a link to get here, the link is outdated.</li>
         </ul>
@@ -50,15 +50,15 @@
     <dt>What can you do?</dt>
     <dd>Have no fear, help is near! There are many ways you can get back on track with Magento Store.</dd>
     <dd>
-        <ul class=\"disc\">
-            <li><a href=\"#\" onclick=\"history.go(-1); return false;\">Go back</a> to the previous page.</li>
+        <ul class="disc">
+            <li><a href="#" onclick="history.go(-1); return false;">Go back</a> to the previous page.</li>
             <li>Use the search bar at the top of the page to search for your products.</li>
-            <li>Follow these links to get you back on track!<br /><a href=\"{{store url=\"\"}}\">Store Home</a>
-            <span class=\"separator\">|</span> <a href=\"{{store url=\"customer/account\"}}\">My Account</a></li>
+            <li>Follow these links to get you back on track!<br /><a href="{{store url=""}}">Store Home</a>
+            <span class="separator">|</span> <a href="{{store url="customer/account"}}">My Account</a></li>
         </ul>
     </dd>
 </dl>
-",
+',
         'is_active'     => 1,
         'stores'        => [0],
         'sort_order'    => 0
@@ -67,7 +67,7 @@
         'title'         => 'Home page',
         'root_template' => 'two_columns_right',
         'identifier'    => 'home',
-        'content'       => "<div class=\"page-title\"><h2>Home Page</h2></div>",
+        'content'       => '<div class="page-title"><h2>Home Page</h2></div>',
         'is_active'     => 1,
         'stores'        => [0],
         'sort_order'    => 0
@@ -76,19 +76,19 @@
         'title'         => 'About Us',
         'root_template' => 'two_columns_right',
         'identifier'    => 'about-magento-demo-store',
-        'content'       => "
-<div class=\"page-title\">
+        'content'       => '
+<div class="page-title">
     <h1>About Magento Store</h1>
 </div>
-<div class=\"col3-set\">
-<div class=\"col-1\"><p style=\"line-height:1.2em;\"><small>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
+<div class="col3-set">
+<div class="col-1"><p style="line-height:1.2em;"><small>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
 Morbi luctus. Duis lobortis. Nulla nec velit. Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec,
 tempus vitae, iaculis semper, pede.</small></p>
-<p style=\"color:#888; font:1.2em/1.4em georgia, serif;\">Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
+<p style="color:#888; font:1.2em/1.4em georgia, serif;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
 Morbi luctus. Duis lobortis. Nulla nec velit. Mauris pulvinar erat non massa. Suspendisse tortor turpis,
 porta nec, tempus vitae, iaculis semper, pede. Cras vel libero id lectus rhoncus porta.</p></div>
-<div class=\"col-2\">
-<p><strong style=\"color:#de036f;\">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus.
+<div class="col-2">
+<p><strong style="color:#de036f;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus.
 Duis lobortis. Nulla nec velit.</strong></p>
 <p>Vivamus tortor nisl, lobortis in, faucibus et, tempus at, dui. Nunc risus. Proin scelerisque augue. Nam ullamcorper.
 Phasellus id massa. Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada
@@ -99,19 +99,19 @@
 Vestibulum sapien dolor, aliquet nec, porta ac, malesuada a, libero. Praesent feugiat purus eget est.
 Nulla facilisi. Vestibulum tincidunt sapien eu velit. Mauris purus. Maecenas eget mauris eu orci accumsan feugiat.
 Pellentesque eget velit. Nunc tincidunt.</p></div>
-<div class=\"col-3\">
+<div class="col-3">
 <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
 faucibus et, tempus at, dui. Nunc risus. Proin scelerisque augue. Nam ullamcorper </p>
-<p><strong style=\"color:#de036f;\">Maecenas ullamcorper, odio vel tempus egestas, dui orci faucibus orci,
+<p><strong style="color:#de036f;">Maecenas ullamcorper, odio vel tempus egestas, dui orci faucibus orci,
 sit amet aliquet lectus dolor et quam. Pellentesque consequat luctus purus.</strong></p>
 <p>Nunc et risus. Etiam a nibh. Phasellus dignissim metus eget nisi.</p>
-<div class=\"divider\"></div>
+<div class="divider"></div>
 <p>To all of you, from all of us at Magento Store - Thank you and Happy eCommerce!</p>
-<p style=\"line-height:1.2em;\"><strong style=\"font:italic 2em Georgia, serif;\">John Doe</strong><br />
+<p style="line-height:1.2em;"><strong style="font:italic 2em Georgia, serif;">John Doe</strong><br />
 <small>Some important guy</small></p></div>
-</div>",
+</div>',
         'is_active'     => 1,
         'stores'        => [0],
         'sort_order'    => 0
@@ -120,20 +120,20 @@
         'title'         => 'Customer Service',
         'root_template' => 'three_columns',
         'identifier'    => 'customer-service',
-        'content'       => "<div class=\"page-title\">
+        'content'       => '<div class="page-title">
 <h1>Customer Service</h1>
 </div>
-<ul class=\"disc\">
-<li><a href=\"#answer1\">Shipping &amp; Delivery</a></li>
-<li><a href=\"#answer2\">Privacy &amp; Security</a></li>
-<li><a href=\"#answer3\">Returns &amp; Replacements</a></li>
-<li><a href=\"#answer4\">Ordering</a></li>
-<li><a href=\"#answer5\">Payment, Pricing &amp; Promotions</a></li>
-<li><a href=\"#answer6\">Viewing Orders</a></li>
-<li><a href=\"#answer7\">Updating Account Information</a></li>
+<ul class="disc">
+<li><a href="#answer1">Shipping &amp; Delivery</a></li>
+<li><a href="#answer2">Privacy &amp; Security</a></li>
+<li><a href="#answer3">Returns &amp; Replacements</a></li>
+<li><a href="#answer4">Ordering</a></li>
+<li><a href="#answer5">Payment, Pricing &amp; Promotions</a></li>
+<li><a href="#answer6">Viewing Orders</a></li>
+<li><a href="#answer7">Updating Account Information</a></li>
 </ul>
 <dl>
-<dt id=\"answer1\">Shipping &amp; Delivery</dt>
+<dt id="answer1">Shipping &amp; Delivery</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -141,7 +141,7 @@
 Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
 Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
 justo.</dd>
-<dt id=\"answer2\">Privacy &amp; Security</dt>
+<dt id="answer2">Privacy &amp; Security</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -149,7 +149,7 @@
 Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
 Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
 justo.</dd>
-<dt id=\"answer3\">Returns &amp; Replacements</dt>
+<dt id="answer3">Returns &amp; Replacements</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -157,7 +157,7 @@
 Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
 Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
 justo.</dd>
-<dt id=\"answer4\">Ordering</dt>
+<dt id="answer4">Ordering</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -165,7 +165,7 @@
 Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
 Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
 justo.</dd>
-<dt id=\"answer5\">Payment, Pricing &amp; Promotions</dt>
+<dt id="answer5">Payment, Pricing &amp; Promotions</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -173,7 +173,7 @@
 Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
 Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
 justo.</dd>
-<dt id=\"answer6\">Viewing Orders</dt>
+<dt id="answer6">Viewing Orders</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
 Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
 Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -181,7 +181,7 @@
  Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
  Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
  justo.</dd>
-<dt id=\"answer7\">Updating Account Information</dt>
+<dt id="answer7">Updating Account Information</dt>
 <dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi luctus. Duis lobortis. Nulla nec velit.
  Mauris pulvinar erat non massa. Suspendisse tortor turpis, porta nec, tempus vitae, iaculis semper, pede.
  Cras vel libero id lectus rhoncus porta. Suspendisse convallis felis ac enim. Vivamus tortor nisl, lobortis in,
@@ -189,7 +189,7 @@
  Pellentesque nisl. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
  Nunc augue. Aenean sed justo non leo vehicula laoreet. Praesent ipsum libero, auctor ac, tempus nec, tempor nec,
  justo.</dd>
-</dl>",
+</dl>',
         'is_active'     => 1,
         'stores'        => [0],
         'sort_order'    => 0
@@ -198,16 +198,16 @@
         'title'         => 'Enable Cookies',
         'root_template' => 'one_column',
         'identifier'    => 'enable-cookies',
-        'content'       => "<div class=\"std\">
-    <ul class=\"messages\">
-        <li class=\"notice-msg\">
+        'content'       => '<div class="std">
+    <ul class="messages">
+        <li class="notice-msg">
             <ul>
                 <li>Please enable cookies in your web browser to continue.</li>
             </ul>
         </li>
     </ul>
-    <div class=\"page-title\">
-        <h1><a name=\"top\"></a>What are Cookies?</h1>
+    <div class="page-title">
+        <h1><a name="top"></a>What are Cookies?</h1>
     </div>
     <p>Cookies are short pieces of data that are sent to your computer when you visit a website.
     On later visits, this data is then returned to that website. Cookies allow us to recognize you automatically
@@ -217,53 +217,53 @@
      or take advantage of certain features of our website, such as storing items in your Shopping Cart or
      receiving personalized recommendations. As a result, we strongly encourage you to configure your web
      browser to accept cookies from our website.</p>
-    <h2 class=\"subtitle\">Enabling Cookies</h2>
-    <ul class=\"disc\">
-        <li><a href=\"#ie7\">Internet Explorer 7.x</a></li>
-        <li><a href=\"#ie6\">Internet Explorer 6.x</a></li>
-        <li><a href=\"#firefox\">Mozilla/Firefox</a></li>
-        <li><a href=\"#opera\">Opera 7.x</a></li>
+    <h2 class="subtitle">Enabling Cookies</h2>
+    <ul class="disc">
+        <li><a href="#ie7">Internet Explorer 7.x</a></li>
+        <li><a href="#ie6">Internet Explorer 6.x</a></li>
+        <li><a href="#firefox">Mozilla/Firefox</a></li>
+        <li><a href="#opera">Opera 7.x</a></li>
     </ul>
-    <h3><a name=\"ie7\"></a>Internet Explorer 7.x</h3>
+    <h3><a name="ie7"></a>Internet Explorer 7.x</h3>
     <ol>
         <li>
             <p>Start Internet Explorer</p>
         </li>
         <li>
             <p>Under the <strong>Tools</strong> menu, click <strong>Internet Options</strong></p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-1.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-1.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Click the <strong>Privacy</strong> tab</p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-2.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-2.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Click the <strong>Advanced</strong> button</p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-3.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-3.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Put a check mark in the box for <strong>Override Automatic Cookie Handling</strong>,
             put another check mark in the <strong>Always accept session cookies </strong>box</p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-4.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-4.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Click <strong>OK</strong></p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-5.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-5.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Click <strong>OK</strong></p>
-            <p><img src=\"{{skin url=\"images/cookies/ie7-6.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie7-6.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Restart Internet Explore</p>
         </li>
     </ol>
-    <p class=\"a-top\"><a href=\"#top\">Back to Top</a></p>
-    <h3><a name=\"ie6\"></a>Internet Explorer 6.x</h3>
+    <p class="a-top"><a href="#top">Back to Top</a></p>
+    <h3><a name="ie6"></a>Internet Explorer 6.x</h3>
     <ol>
         <li>
             <p>Select <strong>Internet Options</strong> from the Tools menu</p>
-            <p><img src=\"{{skin url=\"images/cookies/ie6-1.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie6-1.gif"}}" alt="" /></p>
         </li>
         <li>
             <p>Click on the <strong>Privacy</strong> tab</p>
@@ -271,11 +271,11 @@
         <li>
             <p>Click the <strong>Default</strong> button (or manually slide the bar down to <strong>Medium</strong>)
             under <strong>Settings</strong>. Click <strong>OK</strong></p>
-            <p><img src=\"{{skin url=\"images/cookies/ie6-2.gif\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/ie6-2.gif"}}" alt="" /></p>
         </li>
     </ol>
-    <p class=\"a-top\"><a href=\"#top\">Back to Top</a></p>
-    <h3><a name=\"firefox\"></a>Mozilla/Firefox</h3>
+    <p class="a-top"><a href="#top">Back to Top</a></p>
+    <h3><a name="firefox"></a>Mozilla/Firefox</h3>
     <ol>
         <li>
             <p>Click on the <strong>Tools</strong>-menu in Mozilla</p>
@@ -285,7 +285,7 @@
         </li>
         <li>
             <p>Click on the <strong>Privacy</strong> selection in the left part of the window. (See image below)</p>
-            <p><img src=\"{{skin url=\"images/cookies/firefox.png\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/firefox.png"}}" alt="" /></p>
         </li>
         <li>
             <p>Expand the <strong>Cookies</strong> section</p>
@@ -297,8 +297,8 @@
             <p>Save changes by clicking <strong>Ok</strong>.</p>
         </li>
     </ol>
-    <p class=\"a-top\"><a href=\"#top\">Back to Top</a></p>
-    <h3><a name=\"opera\"></a>Opera 7.x</h3>
+    <p class="a-top"><a href="#top">Back to Top</a></p>
+    <h3><a name="opera"></a>Opera 7.x</h3>
     <ol>
         <li>
             <p>Click on the <strong>Tools</strong> menu in Opera</p>
@@ -308,7 +308,7 @@
         </li>
         <li>
             <p>Click on the <strong>Privacy</strong> selection near the bottom left of the window. (See image below)</p>
-            <p><img src=\"{{skin url=\"images/cookies/opera.png\"}}\" alt=\"\" /></p>
+            <p><img src="{{skin url="images/cookies/opera.png"}}" alt="" /></p>
         </li>
         <li>
             <p>The <strong>Enable cookies</strong> checkbox must be checked, and <strong>Accept all cookies</strong>
@@ -318,9 +318,9 @@
             <p>Save changes by clicking <strong>Ok</strong></p>
         </li>
     </ol>
-    <p class=\"a-top\"><a href=\"#top\">Back to Top</a></p>
+    <p class="a-top"><a href="#top">Back to Top</a></p>
 </div>
-",
+',
         'is_active'     => 1,
         'stores'        => [0]
     ]
diff --git a/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.0-1.6.0.0.1.php b/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.0-1.6.0.0.1.php
index c3e4a763dfba..bcc473e9ca46 100644
--- a/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.0-1.6.0.0.1.php
+++ b/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.0-1.6.0.0.1.php
@@ -252,7 +252,7 @@
     if (preg_match('/<ul>(.*?)<\\/ul>/ims', $content, $matches)) {
         $content = preg_replace('/<li class="last">/ims', '<li>', $content);
         $replacment = '<li class="last privacy">'
-            . "<a href=\"{{store direct_url=\"privacy-policy-cookie-restriction-mode\"}}\">"
+            . '<a href="{{store direct_url="privacy-policy-cookie-restriction-mode"}}">'
             . "Privacy Policy</a></li>\r\n</ul>";
         $content = preg_replace('/<\\/ul>/ims', $replacment, $content);
         $footerLinksBlock->setContent($content)->save();
diff --git a/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.1-1.6.0.0.2.php b/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.1-1.6.0.0.2.php
index 53511bf431e4..5139e277156f 100644
--- a/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.1-1.6.0.0.2.php
+++ b/app/code/core/Mage/Cms/data/cms_setup/data-upgrade-1.6.0.0.1-1.6.0.0.2.php
@@ -13,10 +13,10 @@
  * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
  */
 
-$content = "<p>This website requires cookies to provide all of its features. For more " .
-    "information on what data is contained in the cookies, please see our " .
-    "<a href=\"{{store direct_url=\"privacy-policy-cookie-restriction-mode\"}}\">Privacy Policy page</a>. " .
-    "To accept cookies from this site, please click the Allow button below.</p>";
+$content = '<p>This website requires cookies to provide all of its features. For more ' .
+    'information on what data is contained in the cookies, please see our ' .
+    '<a href="{{store direct_url="privacy-policy-cookie-restriction-mode"}}">Privacy Policy page</a>. ' .
+    'To accept cookies from this site, please click the Allow button below.</p>';
 
 $cmsBlock = [
     'title'         => 'Cookie restriction notice',
diff --git a/app/code/core/Mage/ConfigurableSwatches/Helper/Productimg.php b/app/code/core/Mage/ConfigurableSwatches/Helper/Productimg.php
index 2f4f1619d45b..f210de677cb1 100644
--- a/app/code/core/Mage/ConfigurableSwatches/Helper/Productimg.php
+++ b/app/code/core/Mage/ConfigurableSwatches/Helper/Productimg.php
@@ -299,7 +299,7 @@ public function createSwatchImage($value, $width, $height)
         }
 
         $newImage = imagecreatetruecolor($width, $height);
-        list($r, $g, $b) = sscanf($optionSwatch->getValue(), "#%02x%02x%02x");
+        list($r, $g, $b) = sscanf($optionSwatch->getValue(), '#%02x%02x%02x');
         $backgroundColor = imagecolorallocate($newImage, (int)$r, (int)$g, (int)$b);
         imagefill($newImage, 0, 0, $backgroundColor);
         imagepng($newImage, Mage::getBaseDir(Mage_Core_Model_Store::URL_TYPE_MEDIA) . DS . $destPath);
@@ -382,7 +382,7 @@ public function filterImageInGallery($product, $image)
         }
 
         if (!isset($this->_productImageFilters[$product->getId()])) {
-            $mapping = call_user_func_array("array_merge_recursive", array_values($product->getChildAttributeLabelMapping()));
+            $mapping = call_user_func_array('array_merge_recursive', array_values($product->getChildAttributeLabelMapping()));
             $filters = array_unique($mapping['labels']);
             $filters = array_merge($filters, array_map(function ($label) {
                 return $label . Mage_ConfigurableSwatches_Helper_Productimg::SWATCH_LABEL_SUFFIX;
diff --git a/app/code/core/Mage/Core/Helper/Data.php b/app/code/core/Mage/Core/Helper/Data.php
index 73029d7952ca..07ab738c9e9c 100644
--- a/app/code/core/Mage/Core/Helper/Data.php
+++ b/app/code/core/Mage/Core/Helper/Data.php
@@ -1014,7 +1014,7 @@ public function isRateLimitExceeded(bool $setErrorMessage = true, bool $recordRa
             $cacheTag = 'rate_limit_' . $remoteAddr;
             if (Mage::app()->testCache($cacheTag)) {
                 if ($setErrorMessage) {
-                    $errorMessage = $this->__("Too Soon: You are trying to perform this operation too frequently. Please wait a few seconds and try again.");
+                    $errorMessage = $this->__('Too Soon: You are trying to perform this operation too frequently. Please wait a few seconds and try again.');
                     Mage::getSingleton('core/session')->addError($errorMessage);
                 }
                 return true;
diff --git a/app/code/core/Mage/Core/Helper/Http.php b/app/code/core/Mage/Core/Helper/Http.php
index 09157240db61..89e953790923 100644
--- a/app/code/core/Mage/Core/Helper/Http.php
+++ b/app/code/core/Mage/Core/Helper/Http.php
@@ -62,10 +62,10 @@ public function authValidate($headers = null)
             // IIS Note:: For HTTP Authentication to work with IIS,
             // the PHP directive cgi.rfc2616_headers must be set to 0 (the default value).
             $auth = $_SERVER['HTTP_AUTHORIZATION'];
-            list($user, $pass) = explode(':', base64_decode(substr($auth, strpos($auth, " ") + 1)));
+            list($user, $pass) = explode(':', base64_decode(substr($auth, strpos($auth, ' ') + 1)));
         } elseif (!empty($_SERVER['Authorization'])) {
             $auth = $_SERVER['Authorization'];
-            list($user, $pass) = explode(':', base64_decode(substr($auth, strpos($auth, " ") + 1)));
+            list($user, $pass) = explode(':', base64_decode(substr($auth, strpos($auth, ' ') + 1)));
         }
 
         if (!$user || !$pass) {
diff --git a/app/code/core/Mage/Core/Helper/Js.php b/app/code/core/Mage/Core/Helper/Js.php
index 9dda64d13be5..7bbca2383953 100644
--- a/app/code/core/Mage/Core/Helper/Js.php
+++ b/app/code/core/Mage/Core/Helper/Js.php
@@ -138,7 +138,7 @@ protected function _getTranslateData()
             if (!empty($messages)) {
                 foreach ($messages as $message) {
                     $messageText = (string)$message;
-                    $module = $message->getParent()->getAttribute("module");
+                    $module = $message->getParent()->getAttribute('module');
                     $this->_translateData[$messageText] = Mage::helper(empty($module) ? 'core' : $module)->__($messageText);
                 }
             }
diff --git a/app/code/core/Mage/Core/Helper/String.php b/app/code/core/Mage/Core/Helper/String.php
index 74b8aca84a53..49544a738561 100644
--- a/app/code/core/Mage/Core/Helper/String.php
+++ b/app/code/core/Mage/Core/Helper/String.php
@@ -307,7 +307,7 @@ public function ksortMultibyte(array &$sort)
         if (empty($sort)) {
             return false;
         }
-        $oldLocale = setlocale(LC_COLLATE, "0");
+        $oldLocale = setlocale(LC_COLLATE, '0');
         $localeCode = Mage::app()->getLocale()->getLocaleCode();
         // use fallback locale if $localeCode is not available
         setlocale(LC_COLLATE, $localeCode . '.UTF8', 'C.UTF-8', 'en_US.utf8');
diff --git a/app/code/core/Mage/Core/Helper/Translate.php b/app/code/core/Mage/Core/Helper/Translate.php
index 87c9259cbc76..57b0c1f8c426 100644
--- a/app/code/core/Mage/Core/Helper/Translate.php
+++ b/app/code/core/Mage/Core/Helper/Translate.php
@@ -38,7 +38,7 @@ public function apply($translate, $area, $returnType = 'json')
                 Mage::getDesign()->setArea($area);
             }
             Mage::getModel('core/translate_inline')->processAjaxPost($translate);
-            return $returnType == 'json' ? "{success:true}" : true;
+            return $returnType == 'json' ? '{success:true}' : true;
         } catch (Exception $e) {
             return $returnType == 'json' ? "{error:true,message:'" . $e->getMessage() . "'}" : false;
         }
diff --git a/app/code/core/Mage/Core/Model/App.php b/app/code/core/Mage/Core/Model/App.php
index 9989bd21744d..8149769fa65b 100644
--- a/app/code/core/Mage/Core/Model/App.php
+++ b/app/code/core/Mage/Core/Model/App.php
@@ -1338,7 +1338,7 @@ public function getResponse()
         if (empty($this->_response)) {
             $this->_response = new Mage_Core_Controller_Response_Http();
             $this->_response->headersSentThrowsException = Mage::$headersSentThrowsException;
-            $this->_response->setHeader("Content-Type", "text/html; charset=UTF-8");
+            $this->_response->setHeader('Content-Type', 'text/html; charset=UTF-8');
         }
         return $this->_response;
     }
diff --git a/app/code/core/Mage/Core/Model/Config.php b/app/code/core/Mage/Core/Model/Config.php
index 9cc7b792e679..b921c35fe428 100644
--- a/app/code/core/Mage/Core/Model/Config.php
+++ b/app/code/core/Mage/Core/Model/Config.php
@@ -1785,7 +1785,7 @@ public function getResourceModelClassName($modelClass)
      */
     protected function _makeEventsLowerCase($area, Varien_Simplexml_Config $mergeModel)
     {
-        $events = $mergeModel->getNode($area . "/" . Mage_Core_Model_App_Area::PART_EVENTS);
+        $events = $mergeModel->getNode($area . '/' . Mage_Core_Model_App_Area::PART_EVENTS);
         if ($events !== false) {
             $children = clone $events->children();
             /** @var Mage_Core_Model_Config_Element $event */
diff --git a/app/code/core/Mage/Core/Model/Email/Queue.php b/app/code/core/Mage/Core/Model/Email/Queue.php
index 04b54b385c9e..0607026739ac 100644
--- a/app/code/core/Mage/Core/Model/Email/Queue.php
+++ b/app/code/core/Mage/Core/Model/Email/Queue.php
@@ -193,7 +193,7 @@ public function send()
             if ($message->getId()) {
                 $parameters = new Varien_Object($message->getMessageParameters());
                 if ($parameters->getReturnPathEmail() !== null) {
-                    $mailTransport = new Zend_Mail_Transport_Sendmail("-f" . $parameters->getReturnPathEmail());
+                    $mailTransport = new Zend_Mail_Transport_Sendmail('-f' . $parameters->getReturnPathEmail());
                     Zend_Mail::setDefaultTransport($mailTransport);
                 }
 
diff --git a/app/code/core/Mage/Core/Model/Email/Template.php b/app/code/core/Mage/Core/Model/Email/Template.php
index d57cf4b9dbe1..623b9e2ab5a5 100644
--- a/app/code/core/Mage/Core/Model/Email/Template.php
+++ b/app/code/core/Mage/Core/Model/Email/Template.php
@@ -434,7 +434,7 @@ public function send($email, $name = null, array $variables = [])
         $mail = $this->getMail();
 
         if ($returnPathEmail !== null) {
-            $mailTransport = new Zend_Mail_Transport_Sendmail("-f" . $returnPathEmail);
+            $mailTransport = new Zend_Mail_Transport_Sendmail('-f' . $returnPathEmail);
             Zend_Mail::setDefaultTransport($mailTransport);
         }
 
diff --git a/app/code/core/Mage/Core/Model/Email/Template/Abstract.php b/app/code/core/Mage/Core/Model/Email/Template/Abstract.php
index d11ec8cf8437..4ced0c252064 100644
--- a/app/code/core/Mage/Core/Model/Email/Template/Abstract.php
+++ b/app/code/core/Mage/Core/Model/Email/Template/Abstract.php
@@ -155,12 +155,12 @@ protected function _addEmailVariables($variables, $storeId)
         }
 
         $defaultValuesMap = [
-            "logo_width" => self::XML_PATH_DESIGN_EMAIL_LOGO_WIDTH,
-            "logo_height" => self::XML_PATH_DESIGN_EMAIL_LOGO_HEIGHT,
-            "phone" => Mage_Core_Model_Store::XML_PATH_STORE_STORE_PHONE,
-            "store_phone" => Mage_Core_Model_Store::XML_PATH_STORE_STORE_PHONE,
-            "store_hours" => Mage_Core_Model_Store::XML_PATH_STORE_STORE_HOURS,
-            "store_email" => Mage_Customer_Helper_Data::XML_PATH_SUPPORT_EMAIL,
+            'logo_width' => self::XML_PATH_DESIGN_EMAIL_LOGO_WIDTH,
+            'logo_height' => self::XML_PATH_DESIGN_EMAIL_LOGO_HEIGHT,
+            'phone' => Mage_Core_Model_Store::XML_PATH_STORE_STORE_PHONE,
+            'store_phone' => Mage_Core_Model_Store::XML_PATH_STORE_STORE_PHONE,
+            'store_hours' => Mage_Core_Model_Store::XML_PATH_STORE_STORE_HOURS,
+            'store_email' => Mage_Customer_Helper_Data::XML_PATH_SUPPORT_EMAIL,
         ];
 
         foreach ($defaultValuesMap as $variableName => $configValue) {
@@ -252,7 +252,7 @@ protected function _getCssByConfig($configPath)
             if (!$filesToLoad) {
                 return '';
             }
-            $files = array_map('trim', explode(",", $filesToLoad));
+            $files = array_map('trim', explode(',', $filesToLoad));
 
             $css = '';
             foreach ($files as $fileName) {
diff --git a/app/code/core/Mage/Core/Model/File/Uploader.php b/app/code/core/Mage/Core/Model/File/Uploader.php
index 3b7316b79b82..ecbb8828d1db 100644
--- a/app/code/core/Mage/Core/Model/File/Uploader.php
+++ b/app/code/core/Mage/Core/Model/File/Uploader.php
@@ -109,7 +109,7 @@ public function save($destinationFolder, $newFileName = null)
         $fileName = $newFileName ?? $this->_file['name'];
         if (strlen($fileName) > $this->_fileNameMaxLength) {
             throw new Exception(
-                Mage::helper('core')->__("File name is too long. Maximum length is %s.", $this->_fileNameMaxLength)
+                Mage::helper('core')->__('File name is too long. Maximum length is %s.', $this->_fileNameMaxLength)
             );
         }
         return parent::save($destinationFolder, $newFileName);
diff --git a/app/code/core/Mage/Core/Model/File/Validator/Image.php b/app/code/core/Mage/Core/Model/File/Validator/Image.php
index bac271295006..d7957a1ed0e3 100644
--- a/app/code/core/Mage/Core/Model/File/Validator/Image.php
+++ b/app/code/core/Mage/Core/Model/File/Validator/Image.php
@@ -21,7 +21,7 @@
  */
 class Mage_Core_Model_File_Validator_Image
 {
-    public const NAME = "isImage";
+    public const NAME = 'isImage';
 
     protected $_allowedImageTypes = [
         IMAGETYPE_WEBP,
diff --git a/app/code/core/Mage/Core/Model/Input/Filter.php b/app/code/core/Mage/Core/Model/Input/Filter.php
index 0fa3e22411bb..01b0d27f0be6 100644
--- a/app/code/core/Mage/Core/Model/Input/Filter.php
+++ b/app/code/core/Mage/Core/Model/Input/Filter.php
@@ -250,7 +250,7 @@ protected function _filter(array $data, &$filters = null, $isFilterListSimple =
     protected function _applyFiltrationWithHelper($value, Mage_Core_Helper_Abstract $helper, array $filterData)
     {
         if (!isset($filterData['method']) || empty($filterData['method'])) {
-            throw new Exception("Helper filtration method is not set");
+            throw new Exception('Helper filtration method is not set');
         }
         if (!isset($filterData['args']) || empty($filterData['args'])) {
             $filterData['args'] = [];
diff --git a/app/code/core/Mage/Core/Model/Layout.php b/app/code/core/Mage/Core/Model/Layout.php
index b71d87ce8d04..33243ff947f5 100644
--- a/app/code/core/Mage/Core/Model/Layout.php
+++ b/app/code/core/Mage/Core/Model/Layout.php
@@ -146,7 +146,7 @@ public function getDirectOutput()
     public function generateXml()
     {
         $xml = $this->getUpdate()->asSimplexml();
-        $removeInstructions = $xml->xpath("//remove");
+        $removeInstructions = $xml->xpath('//remove');
         if (is_array($removeInstructions)) {
             foreach ($removeInstructions as $infoNode) {
                 $attributes = $infoNode->attributes();
diff --git a/app/code/core/Mage/Core/Model/Layout/Validator.php b/app/code/core/Mage/Core/Model/Layout/Validator.php
index 9bedeaf86213..0b6960ecb507 100644
--- a/app/code/core/Mage/Core/Model/Layout/Validator.php
+++ b/app/code/core/Mage/Core/Model/Layout/Validator.php
@@ -188,7 +188,7 @@ public function getProtectedExpressions()
      */
     public function getXpathValidationExpression()
     {
-        return implode(" | ", $this->_disallowedXPathExpressions);
+        return implode(' | ', $this->_disallowedXPathExpressions);
     }
 
     /**
@@ -209,7 +209,7 @@ public function getXpathBlockValidationExpression()
         if (!$this->_xpathBlockValidationExpression) {
             if (count($this->_disallowedBlock)) {
                 foreach ($this->_disallowedBlock as $key => $value) {
-                    $this->_xpathBlockValidationExpression .= $key > 0 ? " | " : '';
+                    $this->_xpathBlockValidationExpression .= $key > 0 ? ' | ' : '';
                     $this->_xpathBlockValidationExpression .=
                         "//block[translate(@type, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz') = ";
                     $this->_xpathBlockValidationExpression .=
diff --git a/app/code/core/Mage/Core/Model/Locale.php b/app/code/core/Mage/Core/Model/Locale.php
index d3b70a7c1cd4..0b0b29b8a512 100644
--- a/app/code/core/Mage/Core/Model/Locale.php
+++ b/app/code/core/Mage/Core/Model/Locale.php
@@ -695,7 +695,7 @@ public function getJsPriceFormat()
         if ($pos !== false) {
             $format = substr($format, 0, $pos);
         }
-        $format = preg_replace("/[^0\#\.,]/", "", $format);
+        $format = preg_replace("/[^0\#\.,]/", '', $format);
         $totalPrecision = 0;
         $decimalPoint = strpos($format, '.');
         if ($decimalPoint !== false) {
diff --git a/app/code/core/Mage/Core/Model/Resource/Url/Rewrite/Collection.php b/app/code/core/Mage/Core/Model/Resource/Url/Rewrite/Collection.php
index 373d04b1c115..ae359a25a01d 100644
--- a/app/code/core/Mage/Core/Model/Resource/Url/Rewrite/Collection.php
+++ b/app/code/core/Mage/Core/Model/Resource/Url/Rewrite/Collection.php
@@ -97,7 +97,7 @@ public function filterAllByProductId($productId)
     public function filterAllByCategory()
     {
         $this->getSelect()
-            ->where('id_path LIKE ?', "category/%");
+            ->where('id_path LIKE ?', 'category/%');
         return $this;
     }
 }
diff --git a/app/code/core/Mage/Core/Model/Url.php b/app/code/core/Mage/Core/Model/Url.php
index 0ee085048eb9..c3b01d16ffbc 100644
--- a/app/code/core/Mage/Core/Model/Url.php
+++ b/app/code/core/Mage/Core/Model/Url.php
@@ -1143,7 +1143,7 @@ public function sessionUrlVar($html)
         } else {
             return preg_replace_callback(
                 '#(\?|&amp;|&)___SID=([SU])(&amp;|&)?#',
-                [$this, "sessionVarCallback"],
+                [$this, 'sessionVarCallback'],
                 $html
             );
         }
diff --git a/app/code/core/Mage/Core/functions.php b/app/code/core/Mage/Core/functions.php
index 517f2c2512f1..de853bee9c59 100644
--- a/app/code/core/Mage/Core/functions.php
+++ b/app/code/core/Mage/Core/functions.php
@@ -133,46 +133,46 @@ function mageCoreErrorHandler($errno, $errstr, $errfile, $errline)
 
     switch ($errno) {
         case E_ERROR:
-            $errorMessage .= "Error";
+            $errorMessage .= 'Error';
             break;
         case E_WARNING:
-            $errorMessage .= "Warning";
+            $errorMessage .= 'Warning';
             break;
         case E_PARSE:
-            $errorMessage .= "Parse Error";
+            $errorMessage .= 'Parse Error';
             break;
         case E_NOTICE:
-            $errorMessage .= "Notice";
+            $errorMessage .= 'Notice';
             break;
         case E_CORE_ERROR:
-            $errorMessage .= "Core Error";
+            $errorMessage .= 'Core Error';
             break;
         case E_CORE_WARNING:
-            $errorMessage .= "Core Warning";
+            $errorMessage .= 'Core Warning';
             break;
         case E_COMPILE_ERROR:
-            $errorMessage .= "Compile Error";
+            $errorMessage .= 'Compile Error';
             break;
         case E_COMPILE_WARNING:
-            $errorMessage .= "Compile Warning";
+            $errorMessage .= 'Compile Warning';
             break;
         case E_USER_ERROR:
-            $errorMessage .= "User Error";
+            $errorMessage .= 'User Error';
             break;
         case E_USER_WARNING:
-            $errorMessage .= "User Warning";
+            $errorMessage .= 'User Warning';
             break;
         case E_USER_NOTICE:
-            $errorMessage .= "User Notice";
+            $errorMessage .= 'User Notice';
             break;
         case E_STRICT:
-            $errorMessage .= "Strict Notice";
+            $errorMessage .= 'Strict Notice';
             break;
         case E_RECOVERABLE_ERROR:
-            $errorMessage .= "Recoverable Error";
+            $errorMessage .= 'Recoverable Error';
             break;
         case E_DEPRECATED:
-            $errorMessage .= "Deprecated functionality";
+            $errorMessage .= 'Deprecated functionality';
             break;
         default:
             $errorMessage .= "Unknown error ($errno)";
@@ -200,7 +200,7 @@ function mageDebugBacktrace($return = false, $html = true, $showFirst = false)
     $d = debug_backtrace();
     $out = '';
     if ($html) {
-        $out .= "<pre>";
+        $out .= '<pre>';
     }
     foreach ($d as $i => $r) {
         if (!$showFirst && $i == 0) {
@@ -210,7 +210,7 @@ function mageDebugBacktrace($return = false, $html = true, $showFirst = false)
         @$out .= "[$i] {$r['file']}:{$r['line']}\n";
     }
     if ($html) {
-        $out .= "</pre>";
+        $out .= '</pre>';
     }
     if ($return) {
         return $out;
@@ -256,7 +256,7 @@ function mageDelTree($path)
  * @param string $escape
  * @return array
  */
-function mageParseCsv($string, $delimiter = ",", $enclosure = '"', $escape = '\\')
+function mageParseCsv($string, $delimiter = ',', $enclosure = '"', $escape = '\\')
 {
     $elements = explode($delimiter, $string);
     for ($i = 0; $i < count($elements); $i++) {
diff --git a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.14-0.8.15.php b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.14-0.8.15.php
index f8d5a7742dfe..0e3ae3d17e78 100644
--- a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.14-0.8.15.php
+++ b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.14-0.8.15.php
@@ -16,5 +16,5 @@
 /** @var Mage_Core_Model_Resource_Setup $installer */
 $installer = $this;
 $installer->startSetup();
-$installer->getConnection()->addColumn($installer->getTable('core/email_template'), 'orig_template_code', "VARCHAR(200) DEFAULT NULL");
+$installer->getConnection()->addColumn($installer->getTable('core/email_template'), 'orig_template_code', 'VARCHAR(200) DEFAULT NULL');
 $installer->endSetup();
diff --git a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.15-0.8.16.php b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.15-0.8.16.php
index ca2ff9c49893..4f57a05f12c6 100644
--- a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.15-0.8.16.php
+++ b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.15-0.8.16.php
@@ -20,7 +20,7 @@
 $installer->getConnection()->addColumn(
     $installer->getTable('core_email_template'),
     'template_styles',
-    "text AFTER `template_text`"
+    'text AFTER `template_text`'
 );
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.16-0.8.17.php b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.16-0.8.17.php
index 41216e6067f9..c96ad411d03e 100644
--- a/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.16-0.8.17.php
+++ b/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.16-0.8.17.php
@@ -39,6 +39,6 @@
   CONSTRAINT `FK_CORE_EMAIL_VARIABLE_VALUE_VARIABLE_ID` FOREIGN KEY (`variable_id`) REFERENCES `{$installer->getTable('core_email_variable')}` (`variable_id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8
 ");
-$installer->getConnection()->addColumn($installer->getTable('core/email_template'), 'orig_template_variables', "text NOT NULL");
+$installer->getConnection()->addColumn($installer->getTable('core/email_template'), 'orig_template_variables', 'text NOT NULL');
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Cron/Model/Schedule.php b/app/code/core/Mage/Cron/Model/Schedule.php
index eb014331b6f1..36d2ae698671 100644
--- a/app/code/core/Mage/Cron/Model/Schedule.php
+++ b/app/code/core/Mage/Cron/Model/Schedule.php
@@ -145,7 +145,7 @@ public function matchCronExpression($expr, $num)
                 throw Mage::exception('Mage_Cron', "Invalid cron expression, expecting 'match/modulus': " . $expr);
             }
             if (!is_numeric($e[1])) {
-                throw Mage::exception('Mage_Cron', "Invalid cron expression, expecting numeric modulus: " . $expr);
+                throw Mage::exception('Mage_Cron', 'Invalid cron expression, expecting numeric modulus: ' . $expr);
             }
             $expr = $e[0];
             $mod = $e[1];
@@ -171,7 +171,7 @@ public function matchCronExpression($expr, $num)
         }
 
         if ($from === false || $to === false) {
-            throw Mage::exception('Mage_Cron', "Invalid cron expression: " . $expr);
+            throw Mage::exception('Mage_Cron', 'Invalid cron expression: ' . $expr);
         }
 
         return ($num >= $from) && ($num <= $to) && ($num % $mod === 0);
diff --git a/app/code/core/Mage/Customer/Block/Account/Dashboard/Sidebar.php b/app/code/core/Mage/Customer/Block/Account/Dashboard/Sidebar.php
index 76aa0047faee..30bfffb45d2a 100644
--- a/app/code/core/Mage/Customer/Block/Account/Dashboard/Sidebar.php
+++ b/app/code/core/Mage/Customer/Block/Account/Dashboard/Sidebar.php
@@ -116,7 +116,7 @@ public function getCompareItems()
      */
     public function getCompareJsObjectName()
     {
-        return "dashboardSidebarCompareJsObject";
+        return 'dashboardSidebarCompareJsObject';
     }
 
     /**
diff --git a/app/code/core/Mage/Customer/Model/Convert/Adapter/Customer.php b/app/code/core/Mage/Customer/Model/Convert/Adapter/Customer.php
index 173725a4acdd..e105bf6dfd73 100644
--- a/app/code/core/Mage/Customer/Model/Convert/Adapter/Customer.php
+++ b/app/code/core/Mage/Customer/Model/Convert/Adapter/Customer.php
@@ -403,7 +403,7 @@ public function save()
                     }
                     $i++;
                 }
-                $this->addException(Mage::helper('customer')->__("Saved %d record(s)", $i));
+                $this->addException(Mage::helper('customer')->__('Saved %d record(s)', $i));
             } catch (Exception $e) {
                 if (!$e instanceof Mage_Dataflow_Model_Convert_Exception) {
                     $this->addException(
diff --git a/app/code/core/Mage/Customer/Model/Convert/Parser/Customer.php b/app/code/core/Mage/Customer/Model/Convert/Parser/Customer.php
index 64113720af99..a6a5ab6b317d 100644
--- a/app/code/core/Mage/Customer/Model/Convert/Parser/Customer.php
+++ b/app/code/core/Mage/Customer/Model/Convert/Parser/Customer.php
@@ -258,7 +258,7 @@ public function unparse()
                 if ($attribute->usesSource()) {
                     $option = $attribute->getSource()->getOptionText($value);
                     if ($value && empty($option)) {
-                        $message = Mage::helper('catalog')->__("An invalid option ID is specified for %s (%s), skipping the record.", $field, $value);
+                        $message = Mage::helper('catalog')->__('An invalid option ID is specified for %s (%s), skipping the record.', $field, $value);
                         $this->addException($message, Mage_Dataflow_Model_Convert_Exception::ERROR);
                         continue;
                     }
@@ -329,7 +329,7 @@ public function unparse()
                 $groupCode = $this->_getCustomerGroupCode($customer);
                 if (is_null($groupCode)) {
                     $this->addException(
-                        Mage::helper('catalog')->__("An invalid group ID is specified, skipping the record."),
+                        Mage::helper('catalog')->__('An invalid group ID is specified, skipping the record.'),
                         Mage_Dataflow_Model_Convert_Exception::ERROR
                     );
                     continue;
@@ -467,7 +467,7 @@ public function parse()
                 // get attribute_set_id, if not throw error
                 $row['attribute_set_id'] = $this->getAttributeSetId($entityTypeId, $row['attribute_set']);
                 if (!$row['attribute_set_id']) {
-                    $this->addException(Mage::helper('customer')->__("Invalid attribute set specified, skipping the record."), Varien_Convert_Exception::ERROR);
+                    $this->addException(Mage::helper('customer')->__('Invalid attribute set specified, skipping the record.'), Varien_Convert_Exception::ERROR);
                     continue;
                 }
 
@@ -488,7 +488,7 @@ public function parse()
                 // get store ids
                 $storeIds = $this->getStoreIds($row['store'] ?? $this->getVar('store'));
                 if (!$storeIds) {
-                    $this->addException(Mage::helper('customer')->__("Invalid store specified, skipping the record."), Varien_Convert_Exception::ERROR);
+                    $this->addException(Mage::helper('customer')->__('Invalid store specified, skipping the record.'), Varien_Convert_Exception::ERROR);
                     continue;
                 }
 
@@ -517,7 +517,7 @@ public function parse()
                                 $rowError = true;
                                 $this->addException(
                                     Mage::helper('customer')->__(
-                                        "Invalid attribute option specified for attribute %s (%s), skipping the record.",
+                                        'Invalid attribute option specified for attribute %s (%s), skipping the record.',
                                         $field,
                                         $value
                                     ),
diff --git a/app/code/core/Mage/Customer/Model/Resource/Group/Collection.php b/app/code/core/Mage/Customer/Model/Resource/Group/Collection.php
index 13becdf17527..7dbba37bdac5 100644
--- a/app/code/core/Mage/Customer/Model/Resource/Group/Collection.php
+++ b/app/code/core/Mage/Customer/Model/Resource/Group/Collection.php
@@ -75,7 +75,7 @@ public function addTaxClass()
     {
         $this->getSelect()->joinLeft(
             ['tax_class_table' => $this->getTable('tax/tax_class')],
-            "main_table.tax_class_id = tax_class_table.class_id"
+            'main_table.tax_class_id = tax_class_table.class_id'
         );
         return $this;
     }
diff --git a/app/code/core/Mage/Customer/controllers/AccountController.php b/app/code/core/Mage/Customer/controllers/AccountController.php
index df89ba23189c..8cf9e7399a9d 100644
--- a/app/code/core/Mage/Customer/controllers/AccountController.php
+++ b/app/code/core/Mage/Customer/controllers/AccountController.php
@@ -23,8 +23,8 @@
  */
 class Mage_Customer_AccountController extends Mage_Core_Controller_Front_Action
 {
-    public const CUSTOMER_ID_SESSION_NAME = "customerId";
-    public const TOKEN_SESSION_NAME = "token";
+    public const CUSTOMER_ID_SESSION_NAME = 'customerId';
+    public const TOKEN_SESSION_NAME = 'token';
 
     /**
      * Action list where need check enabled cookie
@@ -895,7 +895,7 @@ public function resetPasswordPostAction()
      */
     protected function getCustomerId()
     {
-        $customerId = $this->getRequest()->getQuery("id");
+        $customerId = $this->getRequest()->getQuery('id');
         if (strlen($customerId) > 12) {
             $customerCollection = Mage::getModel('customer/customer')
                 ->getCollection()
diff --git a/app/code/core/Mage/Dataflow/Model/Convert/Container/Abstract.php b/app/code/core/Mage/Dataflow/Model/Convert/Container/Abstract.php
index 7382de11ff5a..19860511fb11 100644
--- a/app/code/core/Mage/Dataflow/Model/Convert/Container/Abstract.php
+++ b/app/code/core/Mage/Dataflow/Model/Convert/Container/Abstract.php
@@ -129,7 +129,7 @@ public function validateDataSerialized($data = null)
             } catch (Exception $e) {
                 $result = false;
                 $this->addException(
-                    "Invalid data, expecting serialized array.",
+                    'Invalid data, expecting serialized array.',
                     Mage_Dataflow_Model_Convert_Exception::FATAL
                 );
             }
@@ -144,7 +144,7 @@ public function validateDataString($data = null)
             $data = $this->getData();
         }
         if (!is_string($data)) {
-            $this->addException("Invalid data type, expecting string.", Mage_Dataflow_Model_Convert_Exception::FATAL);
+            $this->addException('Invalid data type, expecting string.', Mage_Dataflow_Model_Convert_Exception::FATAL);
         }
         return true;
     }
@@ -155,7 +155,7 @@ public function validateDataArray($data = null)
             $data = $this->getData();
         }
         if (!is_array($data)) {
-            $this->addException("Invalid data type, expecting array.", Mage_Dataflow_Model_Convert_Exception::FATAL);
+            $this->addException('Invalid data type, expecting array.', Mage_Dataflow_Model_Convert_Exception::FATAL);
         }
         return true;
     }
@@ -170,7 +170,7 @@ public function validateDataGrid($data = null)
                 return true;
             }
             $this->addException(
-                "Invalid data type, expecting 2D grid array.",
+                'Invalid data type, expecting 2D grid array.',
                 Mage_Dataflow_Model_Convert_Exception::FATAL
             );
         }
diff --git a/app/code/core/Mage/Dataflow/Model/Convert/Parser/Csv.php b/app/code/core/Mage/Dataflow/Model/Convert/Parser/Csv.php
index a118510405e2..23458115e99e 100644
--- a/app/code/core/Mage/Dataflow/Model/Convert/Parser/Csv.php
+++ b/app/code/core/Mage/Dataflow/Model/Convert/Parser/Csv.php
@@ -162,7 +162,7 @@ public function unparse()
         $io->open();
 
         if (!$batchExportIds) {
-            $io->write("");
+            $io->write('');
             $io->close();
             return $this;
         }
@@ -234,7 +234,7 @@ public function getCsvString($fields = [])
 
         $str = '';
         foreach ($fields as $value) {
-            $escapedValue = Mage::helper("core")->getEscapedCSVData([$value]);
+            $escapedValue = Mage::helper('core')->getEscapedCSVData([$value]);
             $value = $escapedValue[0];
 
             if (str_contains($value, $delimiter) ||
diff --git a/app/code/core/Mage/Dataflow/Model/Convert/Profile/Abstract.php b/app/code/core/Mage/Dataflow/Model/Convert/Profile/Abstract.php
index cc4d6325ad43..95b73e75b176 100644
--- a/app/code/core/Mage/Dataflow/Model/Convert/Profile/Abstract.php
+++ b/app/code/core/Mage/Dataflow/Model/Convert/Profile/Abstract.php
@@ -108,7 +108,7 @@ public function importXml(Varien_Simplexml_Element $profileNode)
     public function run()
     {
         if (!$this->_actions) {
-            $e = new Mage_Dataflow_Model_Convert_Exception("Could not find any actions for this profile");
+            $e = new Mage_Dataflow_Model_Convert_Exception('Could not find any actions for this profile');
             $e->setLevel(Mage_Dataflow_Model_Convert_Exception::FATAL);
             $this->addException($e);
             return;
diff --git a/app/code/core/Mage/Dataflow/Model/Convert/Validator/Dryrun.php b/app/code/core/Mage/Dataflow/Model/Convert/Validator/Dryrun.php
index 84d50adadd5d..da7e6d3d0e31 100644
--- a/app/code/core/Mage/Dataflow/Model/Convert/Validator/Dryrun.php
+++ b/app/code/core/Mage/Dataflow/Model/Convert/Validator/Dryrun.php
@@ -26,7 +26,7 @@ class Mage_Dataflow_Model_Convert_Validator_Dryrun extends Mage_Dataflow_Model_C
     public function validate()
     {
         if ($this->getVar('dry_run') || $this->getProfile()->getDryRun()) {
-            $this->addException(Mage::helper('dataflow')->__("Dry run set, stopping execution."), Mage_Dataflow_Model_Convert_Exception::FATAL);
+            $this->addException(Mage::helper('dataflow')->__('Dry run set, stopping execution.'), Mage_Dataflow_Model_Convert_Exception::FATAL);
         }
         return $this;
     }
diff --git a/app/code/core/Mage/Dataflow/Model/Mysql4/Catalogold.php b/app/code/core/Mage/Dataflow/Model/Mysql4/Catalogold.php
index 31e538084266..c74eaef3c480 100644
--- a/app/code/core/Mage/Dataflow/Model/Mysql4/Catalogold.php
+++ b/app/code/core/Mage/Dataflow/Model/Mysql4/Catalogold.php
@@ -76,8 +76,8 @@ public function addProductToStore($productId, $storeId)
         $write = $this->getConnection();
         $table = $this->getTable('catalog/product_store');
         try {
-            if (!$write->fetchOne("select * from $table where product_id=" . (int)$productId . " and store_id=" . (int)$storeId)) {
-                $write->query("insert into $table (product_id, store_id) values (" . (int)$productId . "," . (int)$storeId . ")");
+            if (!$write->fetchOne("select * from $table where product_id=" . (int)$productId . ' and store_id=' . (int)$storeId)) {
+                $write->query("insert into $table (product_id, store_id) values (" . (int)$productId . ',' . (int)$storeId . ')');
             }
         } catch (Exception $e) {
             throw $e;
diff --git a/app/code/core/Mage/Dataflow/Model/Profile.php b/app/code/core/Mage/Dataflow/Model/Profile.php
index 215937e35be7..8ab3d17216d6 100644
--- a/app/code/core/Mage/Dataflow/Model/Profile.php
+++ b/app/code/core/Mage/Dataflow/Model/Profile.php
@@ -90,7 +90,7 @@ protected function _beforeSave()
         if ($actionsXML !== null && strlen($actionsXML) < 0 &&
             @simplexml_load_string('<data>' . $actionsXML . '</data>', null, LIBXML_NOERROR) === false
         ) {
-            Mage::throwException(Mage::helper('dataflow')->__("Actions XML is not valid."));
+            Mage::throwException(Mage::helper('dataflow')->__('Actions XML is not valid.'));
         }
 
         if (is_array($this->getGuiData())) {
@@ -131,7 +131,7 @@ protected function _beforeSave()
         }
 
         if ($this->_getResource()->isProfileExists($this->getName(), $this->getId())) {
-            Mage::throwException(Mage::helper('dataflow')->__("Profile with the same name already exists."));
+            Mage::throwException(Mage::helper('dataflow')->__('Profile with the same name already exists.'));
         }
         return $this;
     }
@@ -178,8 +178,8 @@ protected function _afterSave()
                     $uploader->save($path);
                     $uploadFile = $uploader->getUploadedFileName();
 
-                    if ($_FILES['file_' . ($index + 1)]['type'] == "text/csv"
-                        || $_FILES['file_' . ($index + 1)]['type'] == "application/vnd.ms-excel"
+                    if ($_FILES['file_' . ($index + 1)]['type'] == 'text/csv'
+                        || $_FILES['file_' . ($index + 1)]['type'] == 'application/vnd.ms-excel'
                     ) {
                         $fileData = $csvParser->getData($path . $uploadFile);
                         $fileData = array_shift($fileData);
diff --git a/app/code/core/Mage/Directory/Model/Country.php b/app/code/core/Mage/Directory/Model/Country.php
index 8c35648c8dae..ed07bcc194f6 100644
--- a/app/code/core/Mage/Directory/Model/Country.php
+++ b/app/code/core/Mage/Directory/Model/Country.php
@@ -94,16 +94,16 @@ public function formatAddress(Varien_Object $address, $html = false)
             if (!$this->getId()) {
                 $template = '{{firstname}} {{lastname}}';
             } elseif (!$html) {
-                $template = "{{firstname}} {{lastname}}
+                $template = '{{firstname}} {{lastname}}
 {{company}}
 {{street1}}
 {{street2}}
-{{city}}, {{region}} {{postcode}}";
+{{city}}, {{region}} {{postcode}}';
             } else {
-                $template = "{{firstname}} {{lastname}}<br/>
+                $template = '{{firstname}} {{lastname}}<br/>
 {{street}}<br/>
 {{city}}, {{region}} {{postcode}}<br/>
-T: {{telephone}}";
+T: {{telephone}}';
             }
         }
 
diff --git a/app/code/core/Mage/Directory/Model/Currency.php b/app/code/core/Mage/Directory/Model/Currency.php
index 8fd5df334320..1363a76498d4 100644
--- a/app/code/core/Mage/Directory/Model/Currency.php
+++ b/app/code/core/Mage/Directory/Model/Currency.php
@@ -260,7 +260,7 @@ public function formatTxt($price, $options = [])
          * %f - the argument is treated as a float, and presented as a floating-point number (locale aware).
          * %F - the argument is treated as a float, and presented as a floating-point number (non-locale aware).
          */
-        $price = sprintf("%F", $price);
+        $price = sprintf('%F', $price);
         if ($price == -0) {
             $price = 0;
         }
diff --git a/app/code/core/Mage/Directory/Model/Currency/Filter.php b/app/code/core/Mage/Directory/Model/Currency/Filter.php
index ed4818226017..51c6bf0a7dba 100644
--- a/app/code/core/Mage/Directory/Model/Currency/Filter.php
+++ b/app/code/core/Mage/Directory/Model/Currency/Filter.php
@@ -67,7 +67,7 @@ public function filter($value)
         $value = Mage::app()->getLocale()->getNumber($value);
         $value = Mage::app()->getStore()->roundPrice($this->_rate * $value);
         //$value = round($value, 2);
-        $value = sprintf("%F", $value);
+        $value = sprintf('%F', $value);
         return $this->_currency->toCurrency($value);
     }
 }
diff --git a/app/code/core/Mage/Directory/Model/Resource/Country/Collection.php b/app/code/core/Mage/Directory/Model/Resource/Country/Collection.php
index 92c210c8f335..97db11c25653 100644
--- a/app/code/core/Mage/Directory/Model/Resource/Country/Collection.php
+++ b/app/code/core/Mage/Directory/Model/Resource/Country/Collection.php
@@ -50,7 +50,7 @@ public function loadByStore($store = null)
     {
         $allowCountries = explode(',', (string)$this->_getStoreConfig('general/country/allow', $store));
         if (!empty($allowCountries)) {
-            $this->addFieldToFilter("country_id", ['in' => $allowCountries]);
+            $this->addFieldToFilter('country_id', ['in' => $allowCountries]);
         }
         return $this;
     }
@@ -119,9 +119,9 @@ public function addCountryIdFilter($countryId)
     {
         if (!empty($countryId)) {
             if (is_array($countryId)) {
-                $this->addFieldToFilter("country_id", ['in' => $countryId]);
+                $this->addFieldToFilter('country_id', ['in' => $countryId]);
             } else {
-                $this->addFieldToFilter("country_id", $countryId);
+                $this->addFieldToFilter('country_id', $countryId);
             }
         }
         return $this;
diff --git a/app/code/core/Mage/Directory/Model/Resource/Currency/Collection.php b/app/code/core/Mage/Directory/Model/Resource/Currency/Collection.php
index 8a203b48a228..3dab83013344 100644
--- a/app/code/core/Mage/Directory/Model/Resource/Currency/Collection.php
+++ b/app/code/core/Mage/Directory/Model/Resource/Currency/Collection.php
@@ -90,9 +90,9 @@ public function addLanguageFilter($lang = null)
     public function addCodeFilter($code)
     {
         if (is_array($code)) {
-            $this->addFieldToFilter("main_table.currency_code", ['in' => $code]);
+            $this->addFieldToFilter('main_table.currency_code', ['in' => $code]);
         } else {
-            $this->addFieldToFilter("main_table.currency_code", $code);
+            $this->addFieldToFilter('main_table.currency_code', $code);
         }
 
         return $this;
diff --git a/app/code/core/Mage/Directory/Model/Resource/Region/Collection.php b/app/code/core/Mage/Directory/Model/Resource/Region/Collection.php
index 09fbdf6d1f00..c262b214cc1d 100644
--- a/app/code/core/Mage/Directory/Model/Resource/Region/Collection.php
+++ b/app/code/core/Mage/Directory/Model/Resource/Region/Collection.php
@@ -168,7 +168,7 @@ public function toOptionArray()
         if (count($options) > 0) {
             array_unshift($options, [
                 'title ' => null,
-                'value' => "",
+                'value' => '',
                 'label' => Mage::helper('directory')->__('-- Please select --')
             ]);
         }
diff --git a/app/code/core/Mage/Downloadable/Model/Resource/Indexer/Price.php b/app/code/core/Mage/Downloadable/Model/Resource/Indexer/Price.php
index 35355af3a065..ccfcc59749e3 100644
--- a/app/code/core/Mage/Downloadable/Model/Resource/Indexer/Price.php
+++ b/app/code/core/Mage/Downloadable/Model/Resource/Indexer/Price.php
@@ -109,7 +109,7 @@ protected function _applyDownloadableLink()
             ->join(
                 ['dl' => $dlType->getBackend()->getTable()],
                 "dl.entity_id = i.entity_id AND dl.attribute_id = {$dlType->getAttributeId()}"
-                    . " AND dl.store_id = 0",
+                    . ' AND dl.store_id = 0',
                 []
             )
             ->join(
diff --git a/app/code/core/Mage/Downloadable/controllers/Adminhtml/Downloadable/FileController.php b/app/code/core/Mage/Downloadable/controllers/Adminhtml/Downloadable/FileController.php
index 49e224f27013..dd05a7658ada 100644
--- a/app/code/core/Mage/Downloadable/controllers/Adminhtml/Downloadable/FileController.php
+++ b/app/code/core/Mage/Downloadable/controllers/Adminhtml/Downloadable/FileController.php
@@ -51,8 +51,8 @@ public function uploadAction()
             /**
              * Workaround for prototype 1.7 methods "isJSON", "evalJSON" on Windows OS
              */
-            $result['tmp_name'] = str_replace(DS, "/", $result['tmp_name']);
-            $result['path'] = str_replace(DS, "/", $result['path']);
+            $result['tmp_name'] = str_replace(DS, '/', $result['tmp_name']);
+            $result['path'] = str_replace(DS, '/', $result['path']);
 
             if (isset($result['file'])) {
                 $fullPath = rtrim($tmpPath, DS) . DS . ltrim($result['file'], DS);
diff --git a/app/code/core/Mage/Downloadable/controllers/DownloadController.php b/app/code/core/Mage/Downloadable/controllers/DownloadController.php
index c46b4059e9db..8bac8cf70785 100644
--- a/app/code/core/Mage/Downloadable/controllers/DownloadController.php
+++ b/app/code/core/Mage/Downloadable/controllers/DownloadController.php
@@ -157,7 +157,7 @@ public function linkAction()
         $id = $this->getRequest()->getParam('id', 0);
         $linkPurchasedItem = Mage::getModel('downloadable/link_purchased_item')->load($id, 'link_hash');
         if (!$linkPurchasedItem->getId()) {
-            $this->_getCustomerSession()->addNotice(Mage::helper('downloadable')->__("Requested link does not exist."));
+            $this->_getCustomerSession()->addNotice(Mage::helper('downloadable')->__('Requested link does not exist.'));
             return $this->_redirect('*/customer/products');
         }
         if (!Mage::helper('downloadable')->getIsShareable($linkPurchasedItem)) {
@@ -179,7 +179,7 @@ public function linkAction()
             }
             $linkPurchased = Mage::getModel('downloadable/link_purchased')->load($linkPurchasedItem->getPurchasedId());
             if ($linkPurchased->getCustomerId() != $customerId) {
-                $this->_getCustomerSession()->addNotice(Mage::helper('downloadable')->__("Requested link does not exist."));
+                $this->_getCustomerSession()->addNotice(Mage::helper('downloadable')->__('Requested link does not exist.'));
                 return $this->_redirect('*/customer/products');
             }
         }
diff --git a/app/code/core/Mage/Eav/Model/Attribute/Data/Multiline.php b/app/code/core/Mage/Eav/Model/Attribute/Data/Multiline.php
index 6a80e7c4c3bc..98110ec10049 100644
--- a/app/code/core/Mage/Eav/Model/Attribute/Data/Multiline.php
+++ b/app/code/core/Mage/Eav/Model/Attribute/Data/Multiline.php
@@ -130,10 +130,10 @@ public function outputValue($format = Mage_Eav_Model_Attribute_Data::OUTPUT_FORM
                 $output = $values;
                 break;
             case Mage_Eav_Model_Attribute_Data::OUTPUT_FORMAT_HTML:
-                $output = implode("<br />", $values);
+                $output = implode('<br />', $values);
                 break;
             case Mage_Eav_Model_Attribute_Data::OUTPUT_FORMAT_ONELINE:
-                $output = implode(" ", $values);
+                $output = implode(' ', $values);
                 break;
             default:
                 $output = implode("\n", $values);
diff --git a/app/code/core/Mage/Eav/Model/Config.php b/app/code/core/Mage/Eav/Model/Config.php
index ac23acf4ab3c..2e04f7c9ce82 100644
--- a/app/code/core/Mage/Eav/Model/Config.php
+++ b/app/code/core/Mage/Eav/Model/Config.php
@@ -505,7 +505,7 @@ public function getAttribute($entityType, $code, $storeId = null)
 
         // return an empty model to avoid breaking compatibility
         if (!$attribute) {
-            $attribute = $this->_hydrateAttribute(["entity_type_id" => $entityType->getId()]);
+            $attribute = $this->_hydrateAttribute(['entity_type_id' => $entityType->getId()]);
         }
 
         return $attribute;
diff --git a/app/code/core/Mage/Eav/Model/Convert/Adapter/Entity.php b/app/code/core/Mage/Eav/Model/Convert/Adapter/Entity.php
index 6439f24f5bf5..736294a58448 100644
--- a/app/code/core/Mage/Eav/Model/Convert/Adapter/Entity.php
+++ b/app/code/core/Mage/Eav/Model/Convert/Adapter/Entity.php
@@ -302,7 +302,7 @@ public function load()
              */
             $entityIds = $collection->getAllIds();
 
-            $message = Mage::helper('eav')->__("Loaded %d records", count($entityIds));
+            $message = Mage::helper('eav')->__('Loaded %d records', count($entityIds));
             $this->addException($message);
         } catch (Varien_Convert_Exception $e) {
             throw $e;
@@ -351,7 +351,7 @@ public function save()
                 $model->save();
                 $i++;
             }
-            $this->addException(Mage::helper('eav')->__("Saved %d record(s).", $i));
+            $this->addException(Mage::helper('eav')->__('Saved %d record(s).', $i));
         } catch (Varien_Convert_Exception $e) {
             throw $e;
         } catch (Exception $e) {
diff --git a/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php b/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php
index dc83e4136159..efa6c2ac6fcb 100644
--- a/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php
+++ b/app/code/core/Mage/Eav/Model/Entity/Attribute/Abstract.php
@@ -760,7 +760,7 @@ protected function _getFlatColumnsOldDefinition()
                 if (isset($prop['PRECISION'], $prop['SCALE'])) {
                     $type .= "({$prop['PRECISION']},{$prop['SCALE']})";
                 } else {
-                    $type .= (isset($prop['LENGTH']) && $prop['LENGTH']) ? "({$prop['LENGTH']})" : "";
+                    $type .= (isset($prop['LENGTH']) && $prop['LENGTH']) ? "({$prop['LENGTH']})" : '';
                 }
                 $columns[$this->getAttributeCode()] = [
                     'type'      => $type,
diff --git a/app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/Abstract.php b/app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/Abstract.php
index ee17d9c6b3cd..faf00f6602de 100644
--- a/app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/Abstract.php
+++ b/app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/Abstract.php
@@ -210,7 +210,7 @@ public function getDefaultValue()
             if ($this->getAttribute()->getDefaultValue()) {
                 $this->_defaultValue = $this->getAttribute()->getDefaultValue();
             } else {
-                $this->_defaultValue = "";
+                $this->_defaultValue = '';
             }
         }
 
diff --git a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute.php b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute.php
index 809c33ffc0c5..41f603795d30 100644
--- a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute.php
+++ b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute.php
@@ -107,7 +107,7 @@ private function _getMaxSortOrder(Mage_Core_Model_Abstract $object)
                 ':attribute_group_id' => $object->getAttributeGroupId()
             ];
             $select = $adapter->select()
-                ->from($this->getTable('eav/entity_attribute'), new Zend_Db_Expr("MAX(sort_order)"))
+                ->from($this->getTable('eav/entity_attribute'), new Zend_Db_Expr('MAX(sort_order)'))
                 ->where('attribute_set_id = :attribute_set_id')
                 ->where('attribute_group_id = :attribute_group_id');
 
@@ -338,7 +338,7 @@ protected function _saveOption(Mage_Core_Model_Abstract $object)
                     foreach ($stores as $store) {
                         if (isset($values[$store->getId()])
                             && (!empty($values[$store->getId()])
-                            || $values[$store->getId()] == "0")
+                            || $values[$store->getId()] == '0')
                         ) {
                             $data = [
                                 'option_id' => $intOptionId,
@@ -429,10 +429,10 @@ public function getAttributeCodesByFrontendType($frontendType)
     public function getFlatUpdateSelect(Mage_Eav_Model_Entity_Attribute_Abstract $attribute, $storeId)
     {
         $adapter = $this->_getReadAdapter();
-        $joinConditionTemplate = "%s.entity_id = %s.entity_id"
-            . " AND %s.entity_type_id = " . $attribute->getEntityTypeId()
-            . " AND %s.attribute_id = " . $attribute->getId()
-            . " AND %s.store_id = %d";
+        $joinConditionTemplate = '%s.entity_id = %s.entity_id'
+            . ' AND %s.entity_type_id = ' . $attribute->getEntityTypeId()
+            . ' AND %s.attribute_id = ' . $attribute->getId()
+            . ' AND %s.store_id = %d';
         $joinCondition = sprintf(
             $joinConditionTemplate,
             'e',
@@ -460,7 +460,7 @@ public function getFlatUpdateSelect(Mage_Eav_Model_Entity_Attribute_Abstract $at
                 [$attribute->getAttributeCode() => $valueExpr]
             );
         if ($attribute->getFlatAddChildData()) {
-            $select->where("e.is_child = ?", 0);
+            $select->where('e.is_child = ?', 0);
         }
 
         return $select;
diff --git a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Group.php b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Group.php
index eb890ed10320..19f6fa8d6312 100644
--- a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Group.php
+++ b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Group.php
@@ -90,7 +90,7 @@ protected function _getMaxSortOrder($object)
         $adapter = $this->_getReadAdapter();
         $bind    = [':attribute_set_id' => $object->getAttributeSetId()];
         $select  = $adapter->select()
-            ->from($this->getMainTable(), new Zend_Db_Expr("MAX(sort_order)"))
+            ->from($this->getMainTable(), new Zend_Db_Expr('MAX(sort_order)'))
             ->where('attribute_set_id = :attribute_set_id');
 
         return $adapter->fetchOne($select, $bind);
diff --git a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Option.php b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Option.php
index 22b62d2a5b41..9d913c2f6e2c 100644
--- a/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Option.php
+++ b/app/code/core/Mage/Eav/Model/Resource/Entity/Attribute/Option.php
@@ -84,10 +84,10 @@ public function getFlatUpdateSelect(
         $attributeTable = $attribute->getBackend()->getTable();
         $attributeCode  = $attribute->getAttributeCode();
 
-        $joinConditionTemplate = "%s.entity_id = %s.entity_id"
-            . " AND %s.entity_type_id = " . $attribute->getEntityTypeId()
-            . " AND %s.attribute_id = " . $attribute->getId()
-            . " AND %s.store_id = %d";
+        $joinConditionTemplate = '%s.entity_id = %s.entity_id'
+            . ' AND %s.entity_type_id = ' . $attribute->getEntityTypeId()
+            . ' AND %s.attribute_id = ' . $attribute->getId()
+            . ' AND %s.store_id = %d';
         $joinCondition = sprintf(
             $joinConditionTemplate,
             'e',
@@ -126,7 +126,7 @@ public function getFlatUpdateSelect(
         }
 
         if ($attribute->getFlatAddChildData()) {
-            $select->where("e.is_child = ?", 0);
+            $select->where('e.is_child = ?', 0);
         }
 
         return $select;
diff --git a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.10-0.7.11.php b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.10-0.7.11.php
index eb1de5771e1e..798de10a2ca7 100644
--- a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.10-0.7.11.php
+++ b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.10-0.7.11.php
@@ -20,7 +20,7 @@
 $table = $installer->getTable('eav/attribute');
 $installer->getConnection()->addColumn(
     $table,
-    "is_filterable_in_search",
+    'is_filterable_in_search',
     "TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '1'"
 );
 $installer->run("
diff --git a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.7-0.7.8.php b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.7-0.7.8.php
index 1d2fa81f5738..237b25a7f6e0 100644
--- a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.7-0.7.8.php
+++ b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.7-0.7.8.php
@@ -17,6 +17,6 @@
 $installer  = $this;
 $installer->startSetup();
 
-$installer->getConnection()->addColumn($installer->getTable('eav/attribute'), "is_visible_in_advanced_search", "TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '0'");
+$installer->getConnection()->addColumn($installer->getTable('eav/attribute'), 'is_visible_in_advanced_search', "TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '0'");
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.9-0.7.10.php b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.9-0.7.10.php
index 7cf31cddb4a6..a91e5b4f716c 100644
--- a/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.9-0.7.10.php
+++ b/app/code/core/Mage/Eav/sql/eav_setup/mysql4-upgrade-0.7.9-0.7.10.php
@@ -16,5 +16,5 @@
 /** @var Mage_Eav_Model_Entity_Setup $installer */
 $installer  = $this;
 $installer->startSetup();
-$installer->getConnection()->addColumn($installer->getTable('eav/attribute'), "is_used_for_price_rules", "TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '1'");
+$installer->getConnection()->addColumn($installer->getTable('eav/attribute'), 'is_used_for_price_rules', "TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '1'");
 $installer->endSetup();
diff --git a/app/code/core/Mage/GiftMessage/Model/Api.php b/app/code/core/Mage/GiftMessage/Model/Api.php
index 9ac15e8ff6bf..edeb794eb00d 100644
--- a/app/code/core/Mage/GiftMessage/Model/Api.php
+++ b/app/code/core/Mage/GiftMessage/Model/Api.php
@@ -81,7 +81,7 @@ public function setForQuote($quoteId, $giftMessage, $store = null)
         $giftMessage['type'] = 'quote';
         $giftMessages = [$quoteId => $giftMessage];
         $request = new Mage_Core_Controller_Request_Http();
-        $request->setParam("giftmessage", $giftMessages);
+        $request->setParam('giftmessage', $giftMessages);
 
         return $this->_setGiftMessage($quote->getId(), $request, $quote);
     }
@@ -123,9 +123,9 @@ public function setForQuoteProduct($quoteId, $productsAndMessages, $store = null
                 }
 
                 if (isset($product['product_id'])) {
-                    $productByItem = $this->_getProduct($product['product_id'], $store, "id");
+                    $productByItem = $this->_getProduct($product['product_id'], $store, 'id');
                 } elseif (isset($product['sku'])) {
-                    $productByItem = $this->_getProduct($product['sku'], $store, "sku");
+                    $productByItem = $this->_getProduct($product['sku'], $store, 'sku');
                 } else {
                     continue;
                 }
@@ -152,7 +152,7 @@ public function setForQuoteItem($quoteItemId, $giftMessage, $store = null)
         /** @var Mage_Sales_Model_Quote_Item $quoteItem */
         $quoteItem = Mage::getModel('sales/quote_item')->load($quoteItemId);
         if (is_null($quoteItem->getId())) {
-            $this->_fault("quote_item_not_exists");
+            $this->_fault('quote_item_not_exists');
         }
 
         $quote = $this->_getQuote($quoteItem->getQuoteId(), $store);
@@ -163,7 +163,7 @@ public function setForQuoteItem($quoteItemId, $giftMessage, $store = null)
         $giftMessages = [$quoteItem->getId() => $giftMessage];
 
         $request = new Mage_Core_Controller_Request_Http();
-        $request->setParam("giftmessage", $giftMessages);
+        $request->setParam('giftmessage', $giftMessages);
 
         return $this->_setGiftMessage($quoteItemId, $request, $quote);
     }
diff --git a/app/code/core/Mage/GoogleAnalytics/Block/Ga.php b/app/code/core/Mage/GoogleAnalytics/Block/Ga.php
index 751c65770d6c..5b62f716095a 100644
--- a/app/code/core/Mage/GoogleAnalytics/Block/Ga.php
+++ b/app/code/core/Mage/GoogleAnalytics/Block/Ga.php
@@ -21,8 +21,8 @@
  */
 class Mage_GoogleAnalytics_Block_Ga extends Mage_Core_Block_Template
 {
-    protected const CHECKOUT_MODULE_NAME = "checkout";
-    protected const CHECKOUT_CONTROLLER_NAME = "onepage";
+    protected const CHECKOUT_MODULE_NAME = 'checkout';
+    protected const CHECKOUT_CONTROLLER_NAME = 'onepage';
 
     /**
      * Render regular page tracking javascript code
@@ -368,7 +368,7 @@ protected function _getEnhancedEcommerceDataForAnalytics4()
         }
 
         foreach ($result as $k => $ga4Event) {
-            $result[$k] = "gtag('event', '{$ga4Event[0]}', " . json_encode($ga4Event[1], JSON_THROW_ON_ERROR) . ");";
+            $result[$k] = "gtag('event', '{$ga4Event[0]}', " . json_encode($ga4Event[1], JSON_THROW_ON_ERROR) . ');';
         }
         return implode("\n", $result);
     }
diff --git a/app/code/core/Mage/GoogleAnalytics/Helper/Data.php b/app/code/core/Mage/GoogleAnalytics/Helper/Data.php
index c2b9686d77d9..b1e98e19f17c 100644
--- a/app/code/core/Mage/GoogleAnalytics/Helper/Data.php
+++ b/app/code/core/Mage/GoogleAnalytics/Helper/Data.php
@@ -182,7 +182,7 @@ public function getLastCategoryName($product): string
             ->addAttributeToSelect('name')
             ->addIdFilter($product->getCategoryIds())
             ->addIsActiveFilter()
-            ->addFieldToFilter('path', ['like' => $storeRootCategory->getPath() . "/%"])
+            ->addFieldToFilter('path', ['like' => $storeRootCategory->getPath() . '/%'])
             ->addOrder('level')
             ->getFirstItem();
         return $lastCategory->getName() ?: '';
diff --git a/app/code/core/Mage/ImportExport/Model/Export/Adapter/Csv.php b/app/code/core/Mage/ImportExport/Model/Export/Adapter/Csv.php
index f8d904de9e0e..32c28990f630 100644
--- a/app/code/core/Mage/ImportExport/Model/Export/Adapter/Csv.php
+++ b/app/code/core/Mage/ImportExport/Model/Export/Adapter/Csv.php
@@ -104,7 +104,7 @@ public function writeRow(array $rowData)
          * @see https://bugzilla.mozilla.org/show_bug.cgi?id=1054702
          */
         $data = array_merge($this->_headerCols, array_intersect_key($rowData, $this->_headerCols));
-        $data = Mage::helper("core")->getEscapedCSVData($data);
+        $data = Mage::helper('core')->getEscapedCSVData($data);
 
         fputcsv(
             $this->_fileHandler,
diff --git a/app/code/core/Mage/ImportExport/Model/Import.php b/app/code/core/Mage/ImportExport/Model/Import.php
index 89527a1e637c..2644486fa14d 100644
--- a/app/code/core/Mage/ImportExport/Model/Import.php
+++ b/app/code/core/Mage/ImportExport/Model/Import.php
@@ -335,7 +335,7 @@ public function isImportAllowed()
      */
     public function expandSource()
     {
-        $writer  = Mage::getModel('importexport/export_adapter_csv', self::getWorkingDir() . "big0.csv");
+        $writer  = Mage::getModel('importexport/export_adapter_csv', self::getWorkingDir() . 'big0.csv');
         $regExps = ['last' => '/(.*?)(\d+)$/', 'middle' => '/(.*?)(\d+)(.*)$/'];
         $colReg  = [
             'sku' => 'last', 'name' => 'last', 'description' => 'last', 'short_description' => 'last',
diff --git a/app/code/core/Mage/ImportExport/Model/Import/Adapter/Abstract.php b/app/code/core/Mage/ImportExport/Model/Import/Adapter/Abstract.php
index 9808582d3d37..5e51c4e3e72d 100644
--- a/app/code/core/Mage/ImportExport/Model/Import/Adapter/Abstract.php
+++ b/app/code/core/Mage/ImportExport/Model/Import/Adapter/Abstract.php
@@ -70,7 +70,7 @@ final public function __construct($source)
             Mage::throwException(Mage::helper('importexport')->__('Source file path must be a string'));
         }
         if (!is_readable($source)) {
-            Mage::throwException(Mage::helper('importexport')->__("%s file does not exists or is not readable", $source));
+            Mage::throwException(Mage::helper('importexport')->__('%s file does not exists or is not readable', $source));
         }
         $this->_source = $source;
 
diff --git a/app/code/core/Mage/ImportExport/Model/Import/Entity/Abstract.php b/app/code/core/Mage/ImportExport/Model/Import/Entity/Abstract.php
index 572535fd856a..6b1b8221b83f 100644
--- a/app/code/core/Mage/ImportExport/Model/Import/Entity/Abstract.php
+++ b/app/code/core/Mage/ImportExport/Model/Import/Entity/Abstract.php
@@ -263,7 +263,7 @@ protected function _saveValidatedBunches()
         $bunchSize       = Mage::helper('importexport')->getBunchSize();
 
         /** @var Mage_Core_Helper_Data $coreHelper */
-        $coreHelper = Mage::helper("core");
+        $coreHelper = Mage::helper('core');
 
         $source->rewind();
         $this->_dataSourceModel->cleanBunches();
@@ -658,7 +658,7 @@ public function validateData()
         if (!$this->_dataValidated) {
             // does all permanent columns exists?
             if (($colsAbsent = array_diff($this->_permanentAttributes, $this->_getSource()->getColNames()))) {
-                file_put_contents($this->_getSource()->getSource(), "");
+                file_put_contents($this->_getSource()->getSource(), '');
                 Mage::throwException(
                     Mage::helper('importexport')->__('Can not find required columns: %s', implode(', ', $colsAbsent))
                 );
diff --git a/app/code/core/Mage/Index/Model/Resource/Helper/Mysql4.php b/app/code/core/Mage/Index/Model/Resource/Helper/Mysql4.php
index ff55e5338158..0521f99f784e 100644
--- a/app/code/core/Mage/Index/Model/Resource/Helper/Mysql4.php
+++ b/app/code/core/Mage/Index/Model/Resource/Helper/Mysql4.php
@@ -44,7 +44,7 @@ public function insertData($object, $select, $destTable, $columns, $readToIndex)
      */
     public function setLock($name)
     {
-        return (bool) $this->_getWriteAdapter()->query("SELECT GET_LOCK(?, ?);", [$name, self::LOCK_GET_TIMEOUT])
+        return (bool) $this->_getWriteAdapter()->query('SELECT GET_LOCK(?, ?);', [$name, self::LOCK_GET_TIMEOUT])
             ->fetchColumn();
     }
 
@@ -56,7 +56,7 @@ public function setLock($name)
      */
     public function releaseLock($name)
     {
-        return (bool) $this->_getWriteAdapter()->query("SELECT RELEASE_LOCK(?);", [$name])->fetchColumn();
+        return (bool) $this->_getWriteAdapter()->query('SELECT RELEASE_LOCK(?);', [$name])->fetchColumn();
     }
 
     /**
@@ -67,7 +67,7 @@ public function releaseLock($name)
      */
     public function isLocked($name)
     {
-        return (bool) $this->_getWriteAdapter()->query("SELECT IS_USED_LOCK(?);", [$name])->fetchColumn();
+        return (bool) $this->_getWriteAdapter()->query('SELECT IS_USED_LOCK(?);', [$name])->fetchColumn();
     }
 
     /**
diff --git a/app/code/core/Mage/Install/Model/Observer.php b/app/code/core/Mage/Install/Model/Observer.php
index 1eb968fa9293..2b679c6cf666 100644
--- a/app/code/core/Mage/Install/Model/Observer.php
+++ b/app/code/core/Mage/Install/Model/Observer.php
@@ -33,8 +33,8 @@ public function bindLocale($observer)
 
     public function installFailure($observer)
     {
-        echo "<h2>There was a problem proceeding with Magento installation.</h2>";
-        echo "<p>Please contact developers with error messages on this page.</p>";
+        echo '<h2>There was a problem proceeding with Magento installation.</h2>';
+        echo '<p>Please contact developers with error messages on this page.</p>';
         echo Mage::printException($observer->getEvent()->getException());
     }
 }
diff --git a/app/code/core/Mage/Log/Model/Aggregation.php b/app/code/core/Mage/Log/Model/Aggregation.php
index 7ab2efa3bf81..6fcaf7de95de 100644
--- a/app/code/core/Mage/Log/Model/Aggregation.php
+++ b/app/code/core/Mage/Log/Model/Aggregation.php
@@ -185,6 +185,6 @@ private function _timestamp($in, $offset = null)
      */
     private function _round($in)
     {
-        return date("Y-m-d H:00:00", $this->_timestamp($in));
+        return date('Y-m-d H:00:00', $this->_timestamp($in));
     }
 }
diff --git a/app/code/core/Mage/Newsletter/Model/Resource/Problem/Collection.php b/app/code/core/Mage/Newsletter/Model/Resource/Problem/Collection.php
index 9faf330354b9..b0045d91f2e8 100644
--- a/app/code/core/Mage/Newsletter/Model/Resource/Problem/Collection.php
+++ b/app/code/core/Mage/Newsletter/Model/Resource/Problem/Collection.php
@@ -107,7 +107,7 @@ protected function _addCustomersData()
 
         $customers = Mage::getResourceModel('customer/customer_collection')
             ->addNameToSelect()
-            ->addAttributeToFilter('entity_id', ["in" => $customersIds]);
+            ->addAttributeToFilter('entity_id', ['in' => $customersIds]);
 
         $customers->load();
 
diff --git a/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php b/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
index 05de12c54c95..511961f0a734 100644
--- a/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
+++ b/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
@@ -83,8 +83,8 @@ protected function _construct()
     public function useQueue(Mage_Newsletter_Model_Queue $queue)
     {
         $this->getSelect()
-            ->join(['link' => $this->_queueLinkTable], "link.subscriber_id = main_table.subscriber_id", [])
-            ->where("link.queue_id = ? ", $queue->getId());
+            ->join(['link' => $this->_queueLinkTable], 'link.subscriber_id = main_table.subscriber_id', [])
+            ->where('link.queue_id = ? ', $queue->getId());
         $this->_queueJoinedFlag = true;
         return $this;
     }
diff --git a/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.1-0.8.2.php b/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.1-0.8.2.php
index c27907eca523..2fedc1728422 100644
--- a/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.1-0.8.2.php
+++ b/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.1-0.8.2.php
@@ -20,7 +20,7 @@
 $installer->getConnection()->addColumn(
     $installer->getTable('newsletter_template'),
     'template_styles',
-    "text AFTER `template_text_preprocessed`"
+    'text AFTER `template_text_preprocessed`'
 );
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.2-0.8.3.php b/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.2-0.8.3.php
index fa3aff72940b..3b185d5e6f82 100644
--- a/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.2-0.8.3.php
+++ b/app/code/core/Mage/Newsletter/sql/newsletter_setup/mysql4-upgrade-0.8.2-0.8.3.php
@@ -20,15 +20,15 @@
 $templateTable = $installer->getTable('newsletter_template');
 $conn = $installer->getConnection();
 
-$conn->addColumn($queueTable, 'newsletter_type', "int(3) default NULL AFTER `template_id`");
-$conn->addColumn($queueTable, 'newsletter_text', "text AFTER `newsletter_type`");
-$conn->addColumn($queueTable, 'newsletter_styles', "text AFTER `newsletter_text`");
-$conn->addColumn($queueTable, 'newsletter_subject', "varchar(200) default NULL AFTER `newsletter_styles`");
-$conn->addColumn($queueTable, 'newsletter_sender_name', "varchar(200) default NULL AFTER `newsletter_subject`");
+$conn->addColumn($queueTable, 'newsletter_type', 'int(3) default NULL AFTER `template_id`');
+$conn->addColumn($queueTable, 'newsletter_text', 'text AFTER `newsletter_type`');
+$conn->addColumn($queueTable, 'newsletter_styles', 'text AFTER `newsletter_text`');
+$conn->addColumn($queueTable, 'newsletter_subject', 'varchar(200) default NULL AFTER `newsletter_styles`');
+$conn->addColumn($queueTable, 'newsletter_sender_name', 'varchar(200) default NULL AFTER `newsletter_subject`');
 $conn->addColumn(
     $queueTable,
     'newsletter_sender_email',
-    "varchar(200) character set latin1 collate latin1_general_ci default NULL AFTER `newsletter_sender_name`"
+    'varchar(200) character set latin1 collate latin1_general_ci default NULL AFTER `newsletter_sender_name`'
 );
 
 $conn->modifyColumn($templateTable, 'template_text_preprocessed', "text comment 'deprecated since 1.4.0.1'");
diff --git a/app/code/core/Mage/Oauth/Block/Adminhtml/Oauth/Consumer/Edit.php b/app/code/core/Mage/Oauth/Block/Adminhtml/Oauth/Consumer/Edit.php
index 473e006ea2f7..0a28788248a9 100644
--- a/app/code/core/Mage/Oauth/Block/Adminhtml/Oauth/Consumer/Edit.php
+++ b/app/code/core/Mage/Oauth/Block/Adminhtml/Oauth/Consumer/Edit.php
@@ -57,7 +57,7 @@ public function __construct()
             'class' => 'save'
         ], 100);
 
-        $this->_formScripts[] = "function saveAndContinueEdit()" .
+        $this->_formScripts[] = 'function saveAndContinueEdit()' .
         "{editForm.submit($('edit_form').action + 'back/edit/')}";
 
         $this->_updateButton('save', 'label', $this->__('Save'));
diff --git a/app/code/core/Mage/Page/Block/Html/Head.php b/app/code/core/Mage/Page/Block/Html/Head.php
index b90c735aa0fb..ca02a259ce56 100644
--- a/app/code/core/Mage/Page/Block/Html/Head.php
+++ b/app/code/core/Mage/Page/Block/Html/Head.php
@@ -44,7 +44,7 @@ protected function _construct()
      * @param bool $before
      * @return $this
      */
-    public function addCss($name, $params = "", $referenceName = "*", $before = null)
+    public function addCss($name, $params = '', $referenceName = '*', $before = null)
     {
         $this->addItem('skin_css', $name, $params, null, null, $referenceName, $before);
         return $this;
@@ -59,7 +59,7 @@ public function addCss($name, $params = "", $referenceName = "*", $before = null
      * @param bool $before
      * @return $this
      */
-    public function addJs($name, $params = "", $referenceName = "*", $before = null)
+    public function addJs($name, $params = '', $referenceName = '*', $before = null)
     {
         $this->addItem('js', $name, $params, null, null, $referenceName, $before);
         return $this;
@@ -75,7 +75,7 @@ public function addJs($name, $params = "", $referenceName = "*", $before = null)
      * @return $this
      * @deprecated
      */
-    public function addCssIe($name, $params = "", $referenceName = "*", $before = null)
+    public function addCssIe($name, $params = '', $referenceName = '*', $before = null)
     {
         return $this;
     }
@@ -90,7 +90,7 @@ public function addCssIe($name, $params = "", $referenceName = "*", $before = nu
      * @return $this
      * @deprecated
      */
-    public function addJsIe($name, $params = "", $referenceName = "*", $before = null)
+    public function addJsIe($name, $params = '', $referenceName = '*', $before = null)
     {
         return $this;
     }
@@ -127,7 +127,7 @@ public function addLinkRel($rel, $href)
      * @param string|bool $before If true insert before the $referenceName instead of after
      * @return $this
      */
-    public function addItem($type, $name, $params = null, $if = null, $cond = null, $referenceName = "*", $before = false)
+    public function addItem($type, $name, $params = null, $if = null, $cond = null, $referenceName = '*', $before = false)
     {
         // allow skipping of parameters in the layout XML files via empty-string
         if ($params === '') {
diff --git a/app/code/core/Mage/Payment/Block/Form/Cc.php b/app/code/core/Mage/Payment/Block/Form/Cc.php
index 5435e7f4a75d..e0c9e1cb58eb 100644
--- a/app/code/core/Mage/Payment/Block/Form/Cc.php
+++ b/app/code/core/Mage/Payment/Block/Form/Cc.php
@@ -132,7 +132,7 @@ public function hasSsCardType()
     public function getSsStartYears()
     {
         $years = [];
-        $first = date("Y");
+        $first = date('Y');
 
         for ($index = 5; $index >= 0; $index--) {
             $year = $first - $index;
diff --git a/app/code/core/Mage/Payment/Model/Config.php b/app/code/core/Mage/Payment/Model/Config.php
index 44a1a96d4224..85ba523dd0f0 100644
--- a/app/code/core/Mage/Payment/Model/Config.php
+++ b/app/code/core/Mage/Payment/Model/Config.php
@@ -134,7 +134,7 @@ public function getMonths()
     public function getYears()
     {
         $years = [];
-        $first = date("Y");
+        $first = date('Y');
 
         for ($index = 0; $index <= 10; $index++) {
             $year = $first + $index;
diff --git a/app/code/core/Mage/Paypal/Model/Config.php b/app/code/core/Mage/Paypal/Model/Config.php
index af3cb556d9c8..d7c558f4bad8 100644
--- a/app/code/core/Mage/Paypal/Model/Config.php
+++ b/app/code/core/Mage/Paypal/Model/Config.php
@@ -784,7 +784,7 @@ public function __get($key)
             return $this->_config[$key];
         }
 
-        $underscored = strtolower(preg_replace('/(.)([A-Z])/', "$1_$2", $key));
+        $underscored = strtolower(preg_replace('/(.)([A-Z])/', '$1_$2', $key));
         if (array_key_exists($underscored, $this->_config)) {
             return $this->_config[$underscored];
         }
@@ -1305,7 +1305,7 @@ public function getAdditionalOptionsLogoUrl($localeCode, $type = false)
      */
     public function getBuildNotationCode()
     {
-        return Mage::getStoreConfig("paypal/bncode", $this->_storeId);
+        return Mage::getStoreConfig('paypal/bncode', $this->_storeId);
     }
 
     /**
@@ -1745,7 +1745,7 @@ protected function _mapBmlFieldset($fieldName)
     {
         switch ($fieldName) {
             case 'allow_ba_signup':
-                return "payment/" . self::METHOD_WPP_EXPRESS . "/{$fieldName}";
+                return 'payment/' . self::METHOD_WPP_EXPRESS . "/{$fieldName}";
             default:
                 return $this->_mapExpressFieldset($fieldName);
         }
@@ -1761,7 +1761,7 @@ protected function _mapBmlUkFieldset($fieldName)
     {
         switch ($fieldName) {
             case 'allow_ba_signup':
-                return "payment/" . self::METHOD_WPP_PE_EXPRESS . "/{$fieldName}";
+                return 'payment/' . self::METHOD_WPP_PE_EXPRESS . "/{$fieldName}";
             default:
                 return $this->_mapExpressFieldset($fieldName);
         }
diff --git a/app/code/core/Mage/Paypal/Model/Hostedpro.php b/app/code/core/Mage/Paypal/Model/Hostedpro.php
index 2cf896764113..23ea50542fd0 100644
--- a/app/code/core/Mage/Paypal/Model/Hostedpro.php
+++ b/app/code/core/Mage/Paypal/Model/Hostedpro.php
@@ -248,8 +248,8 @@ protected function _getUrl($path, $storeId, $secure = null)
     {
         $store = Mage::app()->getStore($storeId);
         return Mage::getUrl($path, [
-            "_store"   => $store,
-            "_secure"  => is_null($secure) ? $store->isCurrentlySecure() : $secure
+            '_store'   => $store,
+            '_secure'  => is_null($secure) ? $store->isCurrentlySecure() : $secure
         ]);
     }
 }
diff --git a/app/code/core/Mage/Paypal/Model/Payflow/Request.php b/app/code/core/Mage/Paypal/Model/Payflow/Request.php
index b7a8494abc3e..56b8f9cf305c 100644
--- a/app/code/core/Mage/Paypal/Model/Payflow/Request.php
+++ b/app/code/core/Mage/Paypal/Model/Payflow/Request.php
@@ -48,6 +48,6 @@ public function __call($method, $args)
             case 'has':
                 return isset($this->_data[$key]);
         }
-        throw new Varien_Exception("Invalid method " . get_class($this) . "::" . $method . "(" . print_r($args, 1) . ")");
+        throw new Varien_Exception('Invalid method ' . get_class($this) . '::' . $method . '(' . print_r($args, 1) . ')');
     }
 }
diff --git a/app/code/core/Mage/Paypal/Model/Report/Settlement.php b/app/code/core/Mage/Paypal/Model/Report/Settlement.php
index 250df5dfa485..fca1da128885 100644
--- a/app/code/core/Mage/Paypal/Model/Report/Settlement.php
+++ b/app/code/core/Mage/Paypal/Model/Report/Settlement.php
@@ -39,31 +39,31 @@ class Mage_Paypal_Model_Report_Settlement extends Mage_Core_Model_Abstract
      * Default PayPal SFTP host
      * @var string
      */
-    public const REPORTS_HOSTNAME = "reports.paypal.com";
+    public const REPORTS_HOSTNAME = 'reports.paypal.com';
 
     /**
      * Default PayPal SFTP host for sandbox mode
      * @var string
      */
-    public const SANDBOX_REPORTS_HOSTNAME = "reports.sandbox.paypal.com";
+    public const SANDBOX_REPORTS_HOSTNAME = 'reports.sandbox.paypal.com';
 
     /**
      * PayPal SFTP path
      * @var string
      */
-    public const REPORTS_PATH = "/ppreports/outgoing";
+    public const REPORTS_PATH = '/ppreports/outgoing';
 
     /**
      * Original charset of old report files
      * @var string
      */
-    public const FILES_IN_CHARSET = "UTF-16";
+    public const FILES_IN_CHARSET = 'UTF-16';
 
     /**
      * Target charset of report files to be parsed
      * @var string
      */
-    public const FILES_OUT_CHARSET = "UTF-8";
+    public const FILES_OUT_CHARSET = 'UTF-8';
 
     /**
      * Reports rows storage
diff --git a/app/code/core/Mage/Paypal/Model/Resource/Payment/Transaction/Collection.php b/app/code/core/Mage/Paypal/Model/Resource/Payment/Transaction/Collection.php
index 51d5a8fac62e..d4bf134aba7b 100644
--- a/app/code/core/Mage/Paypal/Model/Resource/Payment/Transaction/Collection.php
+++ b/app/code/core/Mage/Paypal/Model/Resource/Payment/Transaction/Collection.php
@@ -27,7 +27,7 @@ class Mage_Paypal_Model_Resource_Payment_Transaction_Collection extends Mage_Cor
      *
      * @var string
      */
-    protected $_createdBefore          = "";
+    protected $_createdBefore          = '';
     /**
      * Initialize collection items factory class
      */
diff --git a/app/code/core/Mage/Paypal/Model/System/Config/Source/FetchingSchedule.php b/app/code/core/Mage/Paypal/Model/System/Config/Source/FetchingSchedule.php
index e4079b0d7bd1..f8591fb3f1fe 100644
--- a/app/code/core/Mage/Paypal/Model/System/Config/Source/FetchingSchedule.php
+++ b/app/code/core/Mage/Paypal/Model/System/Config/Source/FetchingSchedule.php
@@ -24,13 +24,13 @@ class Mage_Paypal_Model_System_Config_Source_FetchingSchedule
     public function toOptionArray()
     {
         return [
-            1 => Mage::helper('paypal')->__("Daily"),
-            3 => Mage::helper('paypal')->__("Every 3 days"),
-            7 => Mage::helper('paypal')->__("Every 7 days"),
-            10 => Mage::helper('paypal')->__("Every 10 days"),
-            14 => Mage::helper('paypal')->__("Every 14 days"),
-            30 => Mage::helper('paypal')->__("Every 30 days"),
-            40 => Mage::helper('paypal')->__("Every 40 days"),
+            1 => Mage::helper('paypal')->__('Daily'),
+            3 => Mage::helper('paypal')->__('Every 3 days'),
+            7 => Mage::helper('paypal')->__('Every 7 days'),
+            10 => Mage::helper('paypal')->__('Every 10 days'),
+            14 => Mage::helper('paypal')->__('Every 14 days'),
+            30 => Mage::helper('paypal')->__('Every 30 days'),
+            40 => Mage::helper('paypal')->__('Every 40 days'),
         ];
     }
 }
diff --git a/app/code/core/Mage/Rating/Model/Resource/Rating.php b/app/code/core/Mage/Rating/Model/Resource/Rating.php
index e62d8b650b3b..04accb0f1ce3 100644
--- a/app/code/core/Mage/Rating/Model/Resource/Rating.php
+++ b/app/code/core/Mage/Rating/Model/Resource/Rating.php
@@ -300,7 +300,7 @@ protected function _getEntitySummaryData($object)
     {
         $adapter     = $this->_getReadAdapter();
         $sumColumn   = new Zend_Db_Expr("SUM(rating_vote.{$adapter->quoteIdentifier('percent')})");
-        $countColumn = new Zend_Db_Expr("COUNT(*)");
+        $countColumn = new Zend_Db_Expr('COUNT(*)');
 
         $select = $adapter->select()
             ->from(
diff --git a/app/code/core/Mage/Rating/Model/Resource/Rating/Option/Vote/Collection.php b/app/code/core/Mage/Rating/Model/Resource/Rating/Option/Vote/Collection.php
index 060ee5a37bd4..8eb345ab13a8 100644
--- a/app/code/core/Mage/Rating/Model/Resource/Rating/Option/Vote/Collection.php
+++ b/app/code/core/Mage/Rating/Model/Resource/Rating/Option/Vote/Collection.php
@@ -41,7 +41,7 @@ protected function _construct()
     public function setReviewFilter($reviewId)
     {
         $this->getSelect()
-            ->where("main_table.review_id = ?", $reviewId);
+            ->where('main_table.review_id = ?', $reviewId);
         return $this;
     }
 
@@ -54,7 +54,7 @@ public function setReviewFilter($reviewId)
     public function setEntityPkFilter($entityId)
     {
         $this->getSelect()
-            ->where("entity_pk_value = ?", $entityId);
+            ->where('entity_pk_value = ?', $entityId);
         return $this;
     }
 
diff --git a/app/code/core/Mage/Reports/Helper/Data.php b/app/code/core/Mage/Reports/Helper/Data.php
index 57ea227933b9..9d3b969bb0e9 100644
--- a/app/code/core/Mage/Reports/Helper/Data.php
+++ b/app/code/core/Mage/Reports/Helper/Data.php
@@ -60,11 +60,11 @@ public function getIntervals($from, $to, $period = self::REPORT_PERIOD_TYPE_DAY)
         }
 
         if ($period == self::REPORT_PERIOD_TYPE_MONTH) {
-            $dateStart = new Zend_Date(date("Y-m", $start->getTimestamp()), Varien_Date::DATE_INTERNAL_FORMAT);
+            $dateStart = new Zend_Date(date('Y-m', $start->getTimestamp()), Varien_Date::DATE_INTERNAL_FORMAT);
         }
 
         if ($period == self::REPORT_PERIOD_TYPE_YEAR) {
-            $dateStart = new Zend_Date(date("Y", $start->getTimestamp()), Varien_Date::DATE_INTERNAL_FORMAT);
+            $dateStart = new Zend_Date(date('Y', $start->getTimestamp()), Varien_Date::DATE_INTERNAL_FORMAT);
         }
 
         $dateEnd = new Zend_Date($to, Varien_Date::DATE_INTERNAL_FORMAT);
diff --git a/app/code/core/Mage/Reports/Model/Resource/Customer/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Customer/Collection.php
index bf2cfb8cf57b..9cf8ed63411f 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Customer/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Customer/Collection.php
@@ -115,7 +115,7 @@ public function joinOrders($from = '', $to = '')
         $this->getSelect()
             ->joinLeft(
                 ['orders' => $this->getTable('sales/order')],
-                "orders.customer_id = e.entity_id" . $dateFilter,
+                'orders.customer_id = e.entity_id' . $dateFilter,
                 []
             );
 
@@ -130,9 +130,9 @@ public function joinOrders($from = '', $to = '')
     public function addOrdersCount()
     {
         $this->getSelect()
-            ->columns(["orders_count" => "COUNT(orders.entity_id)"])
+            ->columns(['orders_count' => 'COUNT(orders.entity_id)'])
             ->where('orders.state <> ?', Mage_Sales_Model_Order::STATE_CANCELED)
-            ->group("e.entity_id");
+            ->group('e.entity_id');
 
         return $this;
     }
@@ -158,8 +158,8 @@ public function addSumAvgTotals($storeId = 0)
             : "orders.base_subtotal - {$baseSubtotalCanceled} - {$baseSubtotalRefunded}";
 
         $this->getSelect()
-            ->columns(["orders_avg_amount" => "AVG({$expr})"])
-            ->columns(["orders_sum_amount" => "SUM({$expr})"]);
+            ->columns(['orders_avg_amount' => "AVG({$expr})"])
+            ->columns(['orders_sum_amount' => "SUM({$expr})"]);
 
         return $this;
     }
@@ -271,7 +271,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::COLUMNS);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::HAVING);
-        $countSelect->columns("count(DISTINCT e.entity_id)");
+        $countSelect->columns('count(DISTINCT e.entity_id)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Entity/Summary/Collection/Abstract.php b/app/code/core/Mage/Reports/Model/Resource/Entity/Summary/Collection/Abstract.php
index a74fcccafe38..252ca5549efd 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Entity/Summary/Collection/Abstract.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Entity/Summary/Collection/Abstract.php
@@ -39,22 +39,22 @@ class Mage_Reports_Model_Resource_Entity_Summary_Collection_Abstract extends Var
     public function setSelectPeriod($periodType, $customStart = null, $customEnd = null)
     {
         switch ($periodType) {
-            case "24h":
+            case '24h':
                 $customStart = Varien_Date::toTimestamp(true) - 86400;
                 $customEnd   = Varien_Date::toTimestamp(true);
                 break;
 
-            case "7d":
+            case '7d':
                 $customStart = Varien_Date::toTimestamp(true) - 604800;
                 $customEnd   = Varien_Date::toTimestamp(true);
                 break;
 
-            case "30d":
+            case '30d':
                 $customStart = Varien_Date::toTimestamp(true) - 2592000;
                 $customEnd   = Varien_Date::toTimestamp(true);
                 break;
 
-            case "1y":
+            case '1y':
                 $customStart = Varien_Date::toTimestamp(true) - 31536000;
                 $customEnd   = Varien_Date::toTimestamp(true);
                 break;
diff --git a/app/code/core/Mage/Reports/Model/Resource/Invoiced/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Invoiced/Collection.php
index 625fc7c76dbf..35d50f2f6865 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Invoiced/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Invoiced/Collection.php
@@ -116,7 +116,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::COLUMNS);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::HAVING);
-        $countSelect->columns("COUNT(*)");
+        $countSelect->columns('COUNT(*)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Order/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Order/Collection.php
index 19a497d3e06f..3bc2d3d57b31 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Order/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Order/Collection.php
@@ -772,7 +772,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::COLUMNS);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::HAVING);
-        $countSelect->columns("COUNT(DISTINCT main_table.entity_id)");
+        $countSelect->columns('COUNT(DISTINCT main_table.entity_id)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Product/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Product/Collection.php
index c56128c2c797..c2da53b10d7a 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Product/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Product/Collection.php
@@ -185,7 +185,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::COLUMNS);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::HAVING);
-        $countSelect->columns("count(DISTINCT e.entity_id)");
+        $countSelect->columns('count(DISTINCT e.entity_id)');
 
         return $countSelect;
     }
@@ -206,10 +206,10 @@ public function addCartsCount()
                 'quotes.entity_id = quote_items.quote_id AND quotes.is_active = 1',
                 []
             )
-            ->where("quote_items.product_id = e.entity_id");
+            ->where('quote_items.product_id = e.entity_id');
 
         $this->getSelect()
-            ->columns(["carts" => "({$countSelect})"])
+            ->columns(['carts' => "({$countSelect})"])
             ->group("e.{$this->getProductEntityId()}")
             ->having('carts > ?', 0);
 
@@ -361,7 +361,7 @@ public function addViewsCount($from = '', $to = '')
             ->join(
                 ['e' => $this->getProductEntityTableName()],
                 $this->getConnection()->quoteInto(
-                    "e.entity_id = report_table_views.object_id AND e.entity_type_id = ?",
+                    'e.entity_id = report_table_views.object_id AND e.entity_type_id = ?',
                     $this->getProductEntityTypeId()
                 )
             )
diff --git a/app/code/core/Mage/Reports/Model/Resource/Quote/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Quote/Collection.php
index 8c28b459bede..2ac7a6c8289c 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Quote/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Quote/Collection.php
@@ -288,9 +288,9 @@ public function getSelectCountSql()
         $countSelect->resetJoinLeft();
 
         if ($this->_selectCountSqlType == self::SELECT_COUNT_SQL_TYPE_CART) {
-            $countSelect->columns("COUNT(DISTINCT e.entity_id)");
+            $countSelect->columns('COUNT(DISTINCT e.entity_id)');
         } else {
-            $countSelect->columns("COUNT(DISTINCT main_table.entity_id)");
+            $countSelect->columns('COUNT(DISTINCT main_table.entity_id)');
         }
 
         return $countSelect;
diff --git a/app/code/core/Mage/Reports/Model/Resource/Report/Abstract.php b/app/code/core/Mage/Reports/Model/Resource/Report/Abstract.php
index 3ac56d8df517..92aa5cab1774 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Report/Abstract.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Report/Abstract.php
@@ -371,7 +371,7 @@ public function getStoreTZOffsetQuery($table, $column, $from = null, $to = null,
             return $column;
         }
 
-        $query = "";
+        $query = '';
         $periodsCount = count($periods);
 
         $i = 0;
@@ -384,7 +384,7 @@ public function getStoreTZOffsetQuery($table, $column, $from = null, $to = null,
             $then = $this->_getWriteAdapter()
                 ->getDateAddSql($column, $offset, Varien_Db_Adapter_Interface::INTERVAL_SECOND);
 
-            $query .= (++$i == $periodsCount) ? $then : "CASE WHEN " . implode(" OR ", $subParts) . " THEN $then ELSE ";
+            $query .= (++$i == $periodsCount) ? $then : 'CASE WHEN ' . implode(' OR ', $subParts) . " THEN $then ELSE ";
         }
 
         return $query . str_repeat('END ', count($periods) - 1);
diff --git a/app/code/core/Mage/Reports/Model/Resource/Review/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Review/Collection.php
index cfa8baa3ca1c..4b36f9ec023c 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Review/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Review/Collection.php
@@ -61,7 +61,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
         $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
         $countSelect->reset(Zend_Db_Select::COLUMNS);
-        $countSelect->columns("COUNT(main_table.review_id)");
+        $countSelect->columns('COUNT(main_table.review_id)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Review/Product/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Review/Product/Collection.php
index 3d5727723775..bc3c522d55f5 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Review/Product/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Review/Product/Collection.php
@@ -111,7 +111,7 @@ public function getSelectCountSql()
 
         $countSelect = clone $select;
         $countSelect->reset();
-        $countSelect->from($select, "COUNT(*)");
+        $countSelect->from($select, 'COUNT(*)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Tag/Customer/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Tag/Customer/Collection.php
index 2028bd551bad..18a52825887d 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Tag/Customer/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Tag/Customer/Collection.php
@@ -51,7 +51,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
         $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
         $countSelect->reset(Zend_Db_Select::COLUMNS);
-        $countSelect->columns("COUNT(DISTINCT tr.customer_id)");
+        $countSelect->columns('COUNT(DISTINCT tr.customer_id)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Tax/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Tax/Collection.php
index 15f438aed82e..1a0a59a76c48 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Tax/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Tax/Collection.php
@@ -96,7 +96,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::COLUMNS);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::HAVING);
-        $countSelect->columns("COUNT(DISTINCT e.entity_id)");
+        $countSelect->columns('COUNT(DISTINCT e.entity_id)');
         return $countSelect;
     }
 }
diff --git a/app/code/core/Mage/Reports/Model/Resource/Wishlist/Product/Collection.php b/app/code/core/Mage/Reports/Model/Resource/Wishlist/Product/Collection.php
index fd6ca60dd342..36dd6c982419 100644
--- a/app/code/core/Mage/Reports/Model/Resource/Wishlist/Product/Collection.php
+++ b/app/code/core/Mage/Reports/Model/Resource/Wishlist/Product/Collection.php
@@ -83,7 +83,7 @@ public function getSelectCountSql()
         $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
         $countSelect->reset(Zend_Db_Select::GROUP);
         $countSelect->reset(Zend_Db_Select::COLUMNS);
-        $countSelect->columns("COUNT(*)");
+        $countSelect->columns('COUNT(*)');
 
         return $countSelect;
     }
diff --git a/app/code/core/Mage/Reports/Model/Test.php b/app/code/core/Mage/Reports/Model/Test.php
index b5196abfceb1..3148f231b216 100644
--- a/app/code/core/Mage/Reports/Model/Test.php
+++ b/app/code/core/Mage/Reports/Model/Test.php
@@ -83,11 +83,11 @@ public function getAllLinearExample()
         $allData = [];
         $countOfStartData = 12;
         for ($i = 1; $i <= $countOfStartData; $i++) {
-            $allData[] = ['time' => date("Y-m-d H:i", $startPoint), 'value' => rand(1, 100)];
+            $allData[] = ['time' => date('Y-m-d H:i', $startPoint), 'value' => rand(1, 100)];
             $startPoint += 30 * 60;
         }
 
-        $allData[] = ['time' => date("Y-m-d H:i", $startPoint + (90 * 60))];
+        $allData[] = ['time' => date('Y-m-d H:i', $startPoint + (90 * 60))];
 
         $session -> setData('startPoint', $startPoint);
 
@@ -106,11 +106,11 @@ public function getNewLinearData()
         $reset = 12;
 
         $newData  = [
-            ['time' => date("Y-m-d H:i", $startPoint), 'value' => rand(1, 100)]
+            ['time' => date('Y-m-d H:i', $startPoint), 'value' => rand(1, 100)]
         ];
 
         $startPoint += 30 * 60;
-        $newData[]  = ['time' => date("Y-m-d H:i", $startPoint + (90 * 60))];
+        $newData[]  = ['time' => date('Y-m-d H:i', $startPoint + (90 * 60))];
 
         $session->setData('startPoint', $startPoint);
 
@@ -126,10 +126,10 @@ private function returnAsDataSource(&$array, $reset = 0)
     {
         $dom = new DOMDocument();
         $dom -> preserveWhiteSpace = false;
-        $dom -> loadXML("<" . "?xml version=\"1.0\" encoding=\"UTF-8\"?" . ">\n<dataSource></dataSource>");
+        $dom -> loadXML('<' . '?xml version="1.0" encoding="UTF-8"?' . ">\n<dataSource></dataSource>");
         $root = $dom ->documentElement;
         if ($reset) {
-            $resetItem = $dom -> createElement("reset");
+            $resetItem = $dom -> createElement('reset');
             $resetItem -> nodeValue = $reset;
             $root->appendChild($resetItem);
         }
diff --git a/app/code/core/Mage/Reports/Model/Totals.php b/app/code/core/Mage/Reports/Model/Totals.php
index 33f899cc705c..35460eb88345 100644
--- a/app/code/core/Mage/Reports/Model/Totals.php
+++ b/app/code/core/Mage/Reports/Model/Totals.php
@@ -36,7 +36,7 @@ public function countTotals($grid, $from, $to)
             if ($col->getTotal() === null) {
                 continue;
             }
-            $columns[$col->getIndex()] = ["total" => $col->getTotal(), "value" => 0];
+            $columns[$col->getIndex()] = ['total' => $col->getTotal(), 'value' => 0];
         }
 
         $count = 0;
diff --git a/app/code/core/Mage/Review/Model/Resource/Review.php b/app/code/core/Mage/Review/Model/Resource/Review.php
index fae7c100218b..f04dd65e16fc 100644
--- a/app/code/core/Mage/Review/Model/Resource/Review.php
+++ b/app/code/core/Mage/Review/Model/Resource/Review.php
@@ -147,7 +147,7 @@ protected function _afterSave(Mage_Core_Model_Abstract $object)
         $detailId = $adapter->fetchOne($select, [':review_id' => $object->getId()]);
 
         if ($detailId) {
-            $condition = ["detail_id = ?" => $detailId];
+            $condition = ['detail_id = ?' => $detailId];
             $adapter->update($this->_reviewDetailTable, $detail, $condition);
         } else {
             $detail['store_id']   = $object->getStoreId();
@@ -242,8 +242,8 @@ public function afterDeleteCommit(Mage_Core_Model_Abstract $object)
                     'review_count' => new Zend_Db_Expr('COUNT(*)')
                 ]
             )
-            ->where("entity_id = ?", $object->getEntityId())
-            ->where("entity_pk_value = ?", $object->getEntityPkValue());
+            ->where('entity_id = ?', $object->getEntityId())
+            ->where('entity_pk_value = ?', $object->getEntityPkValue());
         $total_reviews = $read_adapter->fetchOne($select);
         if ($total_reviews == 0) {
             $this->_getWriteAdapter()->delete($this->_aggregateTable, [
diff --git a/app/code/core/Mage/Rule/Model/Action/Abstract.php b/app/code/core/Mage/Rule/Model/Action/Abstract.php
index a810922d2f7b..130ad7db318f 100644
--- a/app/code/core/Mage/Rule/Model/Action/Abstract.php
+++ b/app/code/core/Mage/Rule/Model/Action/Abstract.php
@@ -89,10 +89,10 @@ public function asArray(array $arrAttributes = [])
      */
     public function asXml()
     {
-        return "<type>" . $this->getType() . "</type>"
-            . "<attribute>" . $this->getAttribute() . "</attribute>"
-            . "<operator>" . $this->getOperator() . "</operator>"
-            . "<value>" . $this->getValue() . "</value>";
+        return '<type>' . $this->getType() . '</type>'
+            . '<attribute>' . $this->getAttribute() . '</attribute>'
+            . '<operator>' . $this->getOperator() . '</operator>'
+            . '<value>' . $this->getValue() . '</value>';
     }
 
     /**
@@ -313,7 +313,7 @@ public function getRemoveLinkHtml()
      */
     public function asString($format = '')
     {
-        return "";
+        return '';
     }
 
     /**
diff --git a/app/code/core/Mage/Rule/Model/Action/Collection.php b/app/code/core/Mage/Rule/Model/Action/Collection.php
index 20ee2500c0f8..5e0322669ddf 100644
--- a/app/code/core/Mage/Rule/Model/Action/Collection.php
+++ b/app/code/core/Mage/Rule/Model/Action/Collection.php
@@ -136,7 +136,7 @@ public function asHtmlRecursive()
      */
     public function asString($format = '')
     {
-        return Mage::helper('rule')->__("Perform following actions");
+        return Mage::helper('rule')->__('Perform following actions');
     }
 
     /**
diff --git a/app/code/core/Mage/Rule/Model/Condition/Combine.php b/app/code/core/Mage/Rule/Model/Condition/Combine.php
index 79d4e693c380..afe1d64b717d 100644
--- a/app/code/core/Mage/Rule/Model/Condition/Combine.php
+++ b/app/code/core/Mage/Rule/Model/Condition/Combine.php
@@ -51,7 +51,7 @@ public function prepareConditionSql()
         if (empty($wheres)) {
             return '';
         }
-        $delimiter = $this->getAggregator() == "all" ? ' AND ' : ' OR ';
+        $delimiter = $this->getAggregator() == 'all' ? ' AND ' : ' OR ';
         return ' (' . implode($delimiter, $wheres) . ') ';
     }
 
@@ -232,8 +232,8 @@ public function asArray(array $arrAttributes = [])
      */
     public function asXml($containerKey = 'conditions', $itemKey = 'condition')
     {
-        $xml = "<aggregator>" . $this->getAggregator() . "</aggregator>"
-            . "<value>" . $this->getValue() . "</value>"
+        $xml = '<aggregator>' . $this->getAggregator() . '</aggregator>'
+            . '<value>' . $this->getValue() . '</value>'
             . "<$containerKey>";
         foreach ($this->getConditions() as $condition) {
             $xml .= "<$itemKey>" . $condition->asXml() . "</$itemKey>";
@@ -329,7 +329,7 @@ public function asHtmlRecursive()
      */
     public function asString($format = '')
     {
-        return Mage::helper('rule')->__("If %s of these conditions are %s:", $this->getAggregatorName(), $this->getValueName());
+        return Mage::helper('rule')->__('If %s of these conditions are %s:', $this->getAggregatorName(), $this->getValueName());
     }
 
     /**
diff --git a/app/code/core/Mage/Sales/Block/Order/Email/Items/Default.php b/app/code/core/Mage/Sales/Block/Order/Email/Items/Default.php
index 91a17e15b7f0..3588c5225071 100644
--- a/app/code/core/Mage/Sales/Block/Order/Email/Items/Default.php
+++ b/app/code/core/Mage/Sales/Block/Order/Email/Items/Default.php
@@ -59,7 +59,7 @@ public function getItemOptions()
     public function getValueHtml($value)
     {
         if (is_array($value)) {
-            return sprintf('%d', $value['qty']) . ' x ' . $this->escapeHtml($value['title']) . " "
+            return sprintf('%d', $value['qty']) . ' x ' . $this->escapeHtml($value['title']) . ' '
                 . $this->getItem()->getOrder()->formatPrice($value['price']);
         } else {
             return $this->escapeHtml($value);
diff --git a/app/code/core/Mage/Sales/Block/Order/Email/Items/Order/Default.php b/app/code/core/Mage/Sales/Block/Order/Email/Items/Order/Default.php
index 2b52c1257594..fc76f78481bb 100644
--- a/app/code/core/Mage/Sales/Block/Order/Email/Items/Order/Default.php
+++ b/app/code/core/Mage/Sales/Block/Order/Email/Items/Order/Default.php
@@ -59,7 +59,7 @@ public function getItemOptions()
     public function getValueHtml($value)
     {
         if (is_array($value)) {
-            return sprintf('%d', $value['qty']) . ' x ' . $this->escapeHtml($value['title']) . " "
+            return sprintf('%d', $value['qty']) . ' x ' . $this->escapeHtml($value['title']) . ' '
                 . $this->getItem()->getOrder()->formatPrice($value['price']);
         } else {
             return $this->escapeHtml($value);
diff --git a/app/code/core/Mage/Sales/Model/Observer.php b/app/code/core/Mage/Sales/Model/Observer.php
index 9fd3f68e2df1..0be7dd2ac343 100644
--- a/app/code/core/Mage/Sales/Model/Observer.php
+++ b/app/code/core/Mage/Sales/Model/Observer.php
@@ -111,7 +111,7 @@ public function markQuotesRecollectOnCatalogRules(Varien_Event_Observer $observe
         $product = $observer->getEvent()->getProduct();
 
         if (is_numeric($product)) {
-            $product = Mage::getModel("catalog/product")->load($product);
+            $product = Mage::getModel('catalog/product')->load($product);
         }
         if ($product instanceof Mage_Catalog_Model_Product) {
             $childrenProductList = Mage::getSingleton('catalog/product_type')->factory($product)
diff --git a/app/code/core/Mage/Sales/Model/Order/Api.php b/app/code/core/Mage/Sales/Model/Order/Api.php
index f8d97f13fdb2..9bbf7d519c00 100644
--- a/app/code/core/Mage/Sales/Model/Order/Api.php
+++ b/app/code/core/Mage/Sales/Model/Order/Api.php
@@ -68,7 +68,7 @@ public function items($filters = null)
         $billingAliasName = 'billing_o_a';
         $shippingAliasName = 'shipping_o_a';
 
-        $orderCollection = Mage::getModel("sales/order")->getCollection();
+        $orderCollection = Mage::getModel('sales/order')->getCollection();
         $billingFirstnameField = "$billingAliasName.firstname";
         $billingLastnameField = "$billingAliasName.lastname";
         $shippingFirstnameField = "$shippingAliasName.firstname";
@@ -77,22 +77,22 @@ public function items($filters = null)
             ->addAddressFields()
             ->addExpressionFieldToSelect(
                 'billing_firstname',
-                "{{billing_firstname}}",
+                '{{billing_firstname}}',
                 ['billing_firstname' => $billingFirstnameField]
             )
             ->addExpressionFieldToSelect(
                 'billing_lastname',
-                "{{billing_lastname}}",
+                '{{billing_lastname}}',
                 ['billing_lastname' => $billingLastnameField]
             )
             ->addExpressionFieldToSelect(
                 'shipping_firstname',
-                "{{shipping_firstname}}",
+                '{{shipping_firstname}}',
                 ['shipping_firstname' => $shippingFirstnameField]
             )
             ->addExpressionFieldToSelect(
                 'shipping_lastname',
-                "{{shipping_lastname}}",
+                '{{shipping_lastname}}',
                 ['shipping_lastname' => $shippingLastnameField]
             )
             ->addExpressionFieldToSelect(
diff --git a/app/code/core/Mage/Sales/Model/Order/Config.php b/app/code/core/Mage/Sales/Model/Order/Config.php
index e30b9714775d..44f2076cc254 100644
--- a/app/code/core/Mage/Sales/Model/Order/Config.php
+++ b/app/code/core/Mage/Sales/Model/Order/Config.php
@@ -153,7 +153,7 @@ public function getStates()
     public function getStateStatuses($state, $addLabels = true)
     {
         if (is_array($state)) {
-            $key = implode("|", $state) . $addLabels;
+            $key = implode('|', $state) . $addLabels;
         } else {
             $key = $state . $addLabels;
         }
diff --git a/app/code/core/Mage/Sales/Model/Order/Invoice/Item.php b/app/code/core/Mage/Sales/Model/Order/Invoice/Item.php
index f88b39f3d28c..dccf8f378651 100644
--- a/app/code/core/Mage/Sales/Model/Order/Invoice/Item.php
+++ b/app/code/core/Mage/Sales/Model/Order/Invoice/Item.php
@@ -190,8 +190,8 @@ public function setQty($qty)
         /**
          * Check qty availability
          */
-        $qtyToInvoice = sprintf("%F", $this->getOrderItem()->getQtyToInvoice());
-        $qty = sprintf("%F", $qty);
+        $qtyToInvoice = sprintf('%F', $this->getOrderItem()->getQtyToInvoice());
+        $qty = sprintf('%F', $qty);
         if ($qty <= $qtyToInvoice || $this->getOrderItem()->isDummy()) {
             $this->setData('qty', $qty);
         } else {
diff --git a/app/code/core/Mage/Sales/Model/Order/Pdf/Abstract.php b/app/code/core/Mage/Sales/Model/Order/Pdf/Abstract.php
index cc54947be8d7..4561ae0b3276 100644
--- a/app/code/core/Mage/Sales/Model/Order/Pdf/Abstract.php
+++ b/app/code/core/Mage/Sales/Model/Order/Pdf/Abstract.php
@@ -438,8 +438,8 @@ protected function insertOrder(&$page, $obj, $putOrderId = true)
             }
 
             $yShipments = $this->y;
-            $totalShippingChargesText = "(" . Mage::helper('sales')->__('Total Shipping Charges') . " "
-                . $order->formatPriceTxt($order->getShippingAmount()) . ")";
+            $totalShippingChargesText = '(' . Mage::helper('sales')->__('Total Shipping Charges') . ' '
+                . $order->formatPriceTxt($order->getShippingAmount()) . ')';
 
             $page->drawText($totalShippingChargesText, 285, $yShipments - $topMargin, 'UTF-8');
             $yShipments -= $topMargin + 10;
@@ -663,7 +663,7 @@ protected function _formatOptionValue($value, $order)
             $resultValue .= $value['title'];
 
             if (isset($value['price'])) {
-                $resultValue .= " " . $order->formatPrice($value['price']);
+                $resultValue .= ' ' . $order->formatPrice($value['price']);
             }
             return  $resultValue;
         } else {
diff --git a/app/code/core/Mage/Sales/Model/Order/Pdf/Items/Abstract.php b/app/code/core/Mage/Sales/Model/Order/Pdf/Items/Abstract.php
index 7f76f850a577..79dd95e47ebe 100644
--- a/app/code/core/Mage/Sales/Model/Order/Pdf/Items/Abstract.php
+++ b/app/code/core/Mage/Sales/Model/Order/Pdf/Items/Abstract.php
@@ -211,7 +211,7 @@ protected function _formatOptionValue($value)
             $resultValue .= $value['title'];
 
             if (isset($value['price'])) {
-                $resultValue .= " " . $order->formatPrice($value['price']);
+                $resultValue .= ' ' . $order->formatPrice($value['price']);
             }
             return  $resultValue;
         } else {
diff --git a/app/code/core/Mage/Sales/Model/Recurring/Profile.php b/app/code/core/Mage/Sales/Model/Recurring/Profile.php
index e6c8c5895cfb..fa81c5294704 100644
--- a/app/code/core/Mage/Sales/Model/Recurring/Profile.php
+++ b/app/code/core/Mage/Sales/Model/Recurring/Profile.php
@@ -639,7 +639,7 @@ protected function _getItem($itemInfo)
     {
         $paymentType = $itemInfo->getPaymentType();
         if (!$paymentType) {
-            throw new Exception("Recurring profile payment type is not specified.");
+            throw new Exception('Recurring profile payment type is not specified.');
         }
 
         switch ($paymentType) {
diff --git a/app/code/core/Mage/Sales/Model/Resource/Order.php b/app/code/core/Mage/Sales/Model/Resource/Order.php
index cb853aa8d388..9adad48e276a 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Order.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Order.php
@@ -136,7 +136,7 @@ public function getIncrementId($orderId)
         $adapter = $this->getReadConnection();
         $bind    = [':entity_id' => $orderId];
         $select  = $adapter->select()
-            ->from($this->getMainTable(), ["increment_id"])
+            ->from($this->getMainTable(), ['increment_id'])
             ->where('entity_id = :entity_id');
         return $adapter->fetchOne($select, $bind);
     }
diff --git a/app/code/core/Mage/Sales/Model/Resource/Order/Item/Collection.php b/app/code/core/Mage/Sales/Model/Resource/Order/Item/Collection.php
index ddf9a89208a0..98de0296819f 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Order/Item/Collection.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Order/Item/Collection.php
@@ -129,7 +129,7 @@ public function filterByParent($parentId = null)
     public function addAvailableFilter()
     {
         $fieldExpression = '(qty_shipped - qty_returned)';
-        $resultCondition = $this->_getConditionSql($fieldExpression, ["gt" => 0]);
+        $resultCondition = $this->_getConditionSql($fieldExpression, ['gt' => 0]);
         $this->getSelect()->where($resultCondition);
         return $this;
     }
diff --git a/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.8.13-0.8.14.php b/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.8.13-0.8.14.php
index 43d089aa8545..64cbd84da9c0 100644
--- a/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.8.13-0.8.14.php
+++ b/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.8.13-0.8.14.php
@@ -218,7 +218,7 @@
 
     $installer->run("UPDATE {$this->getTable('sales_order_entity')} SET parent_id={$new_entity_id} WHERE parent_id={$old_entity_id}");
 
-    $tables = ["varchar", "int", "datetime", "text", "decimal"];
+    $tables = ['varchar', 'int', 'datetime', 'text', 'decimal'];
     foreach ($tables as $table) {
         $delete = [];
         $attrs = $installer->getConnection()->fetchAll("SELECT tt.* FROM {$this->getTable('sales_order_entity')}_{$table} tt JOIN eav_attribute on eav_attribute.attribute_id = tt.attribute_id  WHERE entity_id={$old_entity_id}");
diff --git a/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.9.46-0.9.47.php b/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.9.46-0.9.47.php
index 17360573c36b..1ea2f9a34fcf 100644
--- a/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.9.46-0.9.47.php
+++ b/app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.9.46-0.9.47.php
@@ -25,7 +25,7 @@
     $installer->getAttribute($orderEntityTypeId, 'shipping_description')
 ];
 
-$installer->getConnection()->addColumn($this->getTable('sales_order'), $attributes[0]['attribute_code'], "tinyint(1) UNSIGNED NOT NULL DEFAULT 0");
+$installer->getConnection()->addColumn($this->getTable('sales_order'), $attributes[0]['attribute_code'], 'tinyint(1) UNSIGNED NOT NULL DEFAULT 0');
 $installer->getConnection()->addColumn($this->getTable('sales_order'), $attributes[1]['attribute_code'], "varchar(255) NOT NULL DEFAULT ''");
 
 try {
diff --git a/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Found.php b/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Found.php
index 1733189d91c5..aab91530b7e6 100644
--- a/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Found.php
+++ b/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Found.php
@@ -48,7 +48,7 @@ public function loadValueOptions()
      */
     public function asHtml()
     {
-        $html = $this->getTypeElement()->getHtml() . Mage::helper('salesrule')->__("If an item is %s in the cart with %s of these conditions true:", $this->getValueElement()->getHtml(), $this->getAggregatorElement()->getHtml());
+        $html = $this->getTypeElement()->getHtml() . Mage::helper('salesrule')->__('If an item is %s in the cart with %s of these conditions true:', $this->getValueElement()->getHtml(), $this->getAggregatorElement()->getHtml());
         if ($this->getId() != '1') {
             $html .= $this->getRemoveLinkHtml();
         }
diff --git a/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Subselect.php b/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Subselect.php
index bd72f2834637..02a0c54a9f2d 100644
--- a/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Subselect.php
+++ b/app/code/core/Mage/SalesRule/Model/Rule/Condition/Product/Subselect.php
@@ -108,7 +108,7 @@ public function getValueElementType()
     public function asHtml()
     {
         $html = $this->getTypeElement()->getHtml() .
-        Mage::helper('salesrule')->__("If %s %s %s for a subselection of items in cart matching %s of these conditions:", $this->getAttributeElement()->getHtml(), $this->getOperatorElement()->getHtml(), $this->getValueElement()->getHtml(), $this->getAggregatorElement()->getHtml());
+        Mage::helper('salesrule')->__('If %s %s %s for a subselection of items in cart matching %s of these conditions:', $this->getAttributeElement()->getHtml(), $this->getOperatorElement()->getHtml(), $this->getValueElement()->getHtml(), $this->getAggregatorElement()->getHtml());
         if ($this->getId() != '1') {
             $html .= $this->getRemoveLinkHtml();
         }
diff --git a/app/code/core/Mage/SalesRule/sql/salesrule_setup/mysql4-upgrade-0.7.4-0.7.5.php b/app/code/core/Mage/SalesRule/sql/salesrule_setup/mysql4-upgrade-0.7.4-0.7.5.php
index c1ceeb0afebf..3f9175e61474 100644
--- a/app/code/core/Mage/SalesRule/sql/salesrule_setup/mysql4-upgrade-0.7.4-0.7.5.php
+++ b/app/code/core/Mage/SalesRule/sql/salesrule_setup/mysql4-upgrade-0.7.4-0.7.5.php
@@ -36,7 +36,7 @@
     $conn->update(
         $this->getTable('salesrule'),
         ['website_ids' => implode(',', array_keys($websiteIds))],
-        "rule_id=" . $r['rule_id']
+        'rule_id=' . $r['rule_id']
     );
 }
 $conn->dropColumn($this->getTable('salesrule'), 'store_ids');
diff --git a/app/code/core/Mage/Shipping/Model/Resource/Carrier/Tablerate.php b/app/code/core/Mage/Shipping/Model/Resource/Carrier/Tablerate.php
index 912ee11617f4..1e4854703f52 100644
--- a/app/code/core/Mage/Shipping/Model/Resource/Carrier/Tablerate.php
+++ b/app/code/core/Mage/Shipping/Model/Resource/Carrier/Tablerate.php
@@ -112,7 +112,7 @@ public function getRate(Mage_Shipping_Model_Rate_Request $request)
             ->limit(1);
 
         $conditions = [
-            "dest_country_id = :country_id AND dest_region_id = :region_id AND dest_zip = :postcode",
+            'dest_country_id = :country_id AND dest_region_id = :region_id AND dest_zip = :postcode',
             "dest_country_id = :country_id AND dest_region_id = :region_id AND dest_zip = ''",
             "dest_country_id = :country_id AND dest_region_id = '0' AND dest_zip = :postcode",
             "dest_country_id = '0' AND dest_region_id = :region_id AND dest_zip = :postcode",
@@ -397,7 +397,7 @@ protected function _getImportRow($row, $rowNumber = 0)
         }
 
         // protect from duplicate
-        $hash = sprintf("%s-%d-%s-%F", $countryId, $regionId, $zipCode, $value);
+        $hash = sprintf('%s-%d-%s-%F', $countryId, $regionId, $zipCode, $value);
         if (isset($this->_importUniqueHash[$hash])) {
             $this->_importErrors[] = Mage::helper('shipping')->__('Duplicate Row #%s (Country "%s", Region/State "%s", Zip "%s" and Value "%s").', $rowNumber, $row[0], $row[1], $zipCode, $value);
             return false;
diff --git a/app/code/core/Mage/Tag/Model/Resource/Tag/Relation.php b/app/code/core/Mage/Tag/Model/Resource/Tag/Relation.php
index bf174bd08572..b551409dfc85 100644
--- a/app/code/core/Mage/Tag/Model/Resource/Tag/Relation.php
+++ b/app/code/core/Mage/Tag/Model/Resource/Tag/Relation.php
@@ -118,7 +118,7 @@ public function getRelatedTagIds($model)
         $productIds = (is_array($model->getProductId())) ? $model->getProductId() : [$model->getProductId()];
         $select = $this->_getReadAdapter()->select()
             ->from($this->getMainTable(), 'tag_id')
-            ->where("product_id IN(?)", $productIds)
+            ->where('product_id IN(?)', $productIds)
             ->order('tag_id');
         return $this->_getReadAdapter()->fetchCol($select);
     }
diff --git a/app/code/core/Mage/Tax/Helper/Data.php b/app/code/core/Mage/Tax/Helper/Data.php
index 82012c90f7e3..88dbf246ad8f 100644
--- a/app/code/core/Mage/Tax/Helper/Data.php
+++ b/app/code/core/Mage/Tax/Helper/Data.php
@@ -833,7 +833,7 @@ public function getPriceTaxSql($priceField, $taxClassField)
                 $$rateVariable = '';
                 foreach ($$rateArray as $classId => $rate) {
                     if ($rate) {
-                        $$rateVariable .= sprintf("WHEN %d THEN %12.4f ", $classId, $rate / 100);
+                        $$rateVariable .= sprintf('WHEN %d THEN %12.4f ', $classId, $rate / 100);
                     }
                 }
                 if ($$rateVariable) {
diff --git a/app/code/core/Mage/Tax/Model/Resource/Calculation.php b/app/code/core/Mage/Tax/Model/Resource/Calculation.php
index 9c1cc5d72843..d73a7bcc5592 100644
--- a/app/code/core/Mage/Tax/Model/Resource/Calculation.php
+++ b/app/code/core/Mage/Tax/Model/Resource/Calculation.php
@@ -292,12 +292,12 @@ protected function _getRates($request)
                 )
                 ->joinLeft(
                     ['title_table' => $this->getTable('tax/tax_calculation_rate_title')],
-                    "rate.tax_calculation_rate_id = title_table.tax_calculation_rate_id "
+                    'rate.tax_calculation_rate_id = title_table.tax_calculation_rate_id '
                     . "AND title_table.store_id = '{$storeId}'",
                     ['title' => $ifnullTitleValue]
                 )
                 ->where('rate.tax_country_id = ?', $countryId)
-                ->where("rate.tax_region_id IN(?)", [0, (int)$regionId]);
+                ->where('rate.tax_region_id IN(?)', [0, (int)$regionId]);
             $postcodeIsNumeric = is_numeric($postcode);
             $postcodeIsRange = false;
             if (preg_match('/^(.+)-(.+)$/', $postcode, $matches)) {
@@ -371,7 +371,7 @@ public function getApplicableRateIds($request)
         $select = $this->_getReadAdapter()->select()
             ->from(['rate' => $this->getTable('tax/tax_calculation_rate')], ['tax_calculation_rate_id'])
             ->where('rate.tax_country_id = ?', $countryId)
-            ->where("rate.tax_region_id IN(?)", [0, (int)$regionId]);
+            ->where('rate.tax_region_id IN(?)', [0, (int)$regionId]);
 
         $expr = $this->_getWriteAdapter()->getCheckSql(
             'zip_is_range is NULL',
diff --git a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.4-0.7.5.php b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.4-0.7.5.php
index 1787bc436b7b..2c32d0137092 100644
--- a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.4-0.7.5.php
+++ b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.4-0.7.5.php
@@ -27,7 +27,7 @@
     $installer->run(
         "UPDATE {$installer->getTable('customer_group')}
             SET tax_class_id = {$customerTaxClassIds[0]}
-            WHERE tax_class_id NOT IN (" . implode(',', $customerTaxClassIds) . ")"
+            WHERE tax_class_id NOT IN (" . implode(',', $customerTaxClassIds) . ')'
     );
 }
 
diff --git a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.7-0.7.8.php b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.7-0.7.8.php
index 2ab25630bb3c..279d5d8696d4 100644
--- a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.7-0.7.8.php
+++ b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.7-0.7.8.php
@@ -17,6 +17,6 @@
 $installer = $this;
 $installer->startSetup();
 
-$installer->getConnection()->addColumn($installer->getTable('sales_order_tax'), 'hidden', "smallint (5) unsigned not null default 0");
+$installer->getConnection()->addColumn($installer->getTable('sales_order_tax'), 'hidden', 'smallint (5) unsigned not null default 0');
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.9-0.7.10.php b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.9-0.7.10.php
index e93d93573b11..313641716bc7 100644
--- a/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.9-0.7.10.php
+++ b/app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.9-0.7.10.php
@@ -19,9 +19,9 @@
 
 $table = $installer->getTable('tax_calculation_rate');
 
-$installer->getConnection()->addColumn($table, 'zip_is_range', "TINYINT(1) DEFAULT NULL");
-$installer->getConnection()->addColumn($table, 'zip_from', "VARCHAR(10) DEFAULT NULL");
-$installer->getConnection()->addColumn($table, 'zip_to', "VARCHAR(10) DEFAULT NULL");
+$installer->getConnection()->addColumn($table, 'zip_is_range', 'TINYINT(1) DEFAULT NULL');
+$installer->getConnection()->addColumn($table, 'zip_from', 'VARCHAR(10) DEFAULT NULL');
+$installer->getConnection()->addColumn($table, 'zip_to', 'VARCHAR(10) DEFAULT NULL');
 
 $installer->getConnection()->addKey($table, 'IDX_TAX_CALCULATION_RATE_RANGE', ['tax_calculation_rate_id', 'tax_country_id', 'tax_region_id', 'zip_is_range', 'tax_postcode']);
 
diff --git a/app/code/core/Mage/Uploader/Model/Config/Abstract.php b/app/code/core/Mage/Uploader/Model/Config/Abstract.php
index 2bee5f1a3478..906801629f03 100644
--- a/app/code/core/Mage/Uploader/Model/Config/Abstract.php
+++ b/app/code/core/Mage/Uploader/Model/Config/Abstract.php
@@ -56,6 +56,6 @@ public function __call($method, $args)
             case 'has':
                 return isset($this->_data[$key]);
         }
-        throw new Varien_Exception("Invalid method " . get_class($this) . "::" . $method . "(" . print_r($args, 1) . ")");
+        throw new Varien_Exception('Invalid method ' . get_class($this) . '::' . $method . '(' . print_r($args, 1) . ')');
     }
 }
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl.php
index 17b72682502c..33b389462007 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl.php
@@ -1070,7 +1070,7 @@ protected function _parseXmlTrackingResponse($trackings, $response)
                                         */
                                         $rArr['service'] = (string)$txml->Service->Desc;
                                         if (isset($txml->Weight)) {
-                                            $rArr['weight'] = (string)$txml->Weight . " lbs";
+                                            $rArr['weight'] = (string)$txml->Weight . ' lbs';
                                         }
                                         if (isset($txml->Delivery)) {
                                             $rArr['deliverydate'] = (string)$txml->Delivery->Date;
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/International.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/International.php
index 8700e0181ed8..0e3953c2a74c 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/International.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/International.php
@@ -799,7 +799,7 @@ protected function _getQuotes()
                 $code = $bodyXml->xpath('//GetQuoteResponse/Note/Condition/ConditionCode');
                 if (isset($code[0]) && (int)$code[0] == self::CONDITION_CODE_SERVICE_DATE_UNAVAILABLE) {
                     $debugPoint['info'] = sprintf(
-                        Mage::helper('usa')->__("DHL service is not available at %s date"),
+                        Mage::helper('usa')->__('DHL service is not available at %s date'),
                         $date
                     );
                 } else {
@@ -886,7 +886,7 @@ protected function _buildQuotesRequestXml()
             $nodeDutiable = $nodeGetQuote->addChild('Dutiable');
             $baseCurrencyCode = Mage::app()->getWebsite($this->_request->getWebsiteId())->getBaseCurrencyCode();
             $nodeDutiable->addChild('DeclaredCurrency', $baseCurrencyCode);
-            $nodeDutiable->addChild('DeclaredValue', sprintf("%.2F", $rawRequest->getValue()));
+            $nodeDutiable->addChild('DeclaredValue', sprintf('%.2F', $rawRequest->getValue()));
         }
         return $xml;
     }
@@ -1026,7 +1026,7 @@ protected function _addRate(SimpleXMLElement $shipmentDetails)
                     }
                     if (!isset($rates[$currencyCode]) || !$totalEstimate) {
                         $totalEstimate = false;
-                        $this->_errors[] = Mage::helper('usa')->__("Exchange rate %s (Base Currency) -> %s not found. DHL method %s skipped", $currencyCode, $baseCurrencyCode, $dhlProductDescription);
+                        $this->_errors[] = Mage::helper('usa')->__('Exchange rate %s (Base Currency) -> %s not found. DHL method %s skipped', $currencyCode, $baseCurrencyCode, $dhlProductDescription);
                     }
                 }
             }
@@ -1051,7 +1051,7 @@ protected function _addRate(SimpleXMLElement $shipmentDetails)
             if (isset($shipmentDetails->GlobalProductCode)) {
                 $dhlProductDescription  = $this->getDhlProductTitle((string)$shipmentDetails->GlobalProductCode);
             }
-            $dhlProductDescription = $dhlProductDescription ? $dhlProductDescription : Mage::helper('usa')->__("DHL");
+            $dhlProductDescription = $dhlProductDescription ? $dhlProductDescription : Mage::helper('usa')->__('DHL');
             $this->_errors[] = Mage::helper('usa')->__("Zero shipping charge for '%s'", $dhlProductDescription);
         }
         return $this;
@@ -1067,7 +1067,7 @@ protected function _getDimensionUnit()
         $countryId = $this->_rawRequest->getOrigCountryId();
         $measureUnit = $this->getCountryParams($countryId)->getMeasureUnit();
         if (empty($measureUnit)) {
-            Mage::throwException(Mage::helper('usa')->__("Cannot identify measure unit for %s", $countryId));
+            Mage::throwException(Mage::helper('usa')->__('Cannot identify measure unit for %s', $countryId));
         }
         return $measureUnit;
     }
@@ -1082,7 +1082,7 @@ protected function _getWeightUnit()
         $countryId = $this->_rawRequest->getOrigCountryId();
         $weightUnit = $this->getCountryParams($countryId)->getWeightUnit();
         if (empty($weightUnit)) {
-            Mage::throwException(Mage::helper('usa')->__("Cannot identify weight unit for %s", $countryId));
+            Mage::throwException(Mage::helper('usa')->__('Cannot identify weight unit for %s', $countryId));
         }
         return $weightUnit;
     }
@@ -1235,7 +1235,7 @@ protected function _mapRequestToShipment(Varien_Object $request)
      */
     protected function _getMinDimension($dimensionUnit)
     {
-        return $dimensionUnit == "CENTIMETER" ? self::DIMENSION_MIN_CM : self::DIMENSION_MIN_IN;
+        return $dimensionUnit == 'CENTIMETER' ? self::DIMENSION_MIN_CM : self::DIMENSION_MIN_IN;
     }
 
     /**
@@ -1345,7 +1345,7 @@ protected function _doRequest()
             $nodeDutiable = $xml->addChild('Dutiable', '', '');
             $nodeDutiable->addChild(
                 'DeclaredValue',
-                sprintf("%.2F", $rawRequest->getOrderShipment()->getOrder()->getSubtotal())
+                sprintf('%.2F', $rawRequest->getOrderShipment()->getOrder()->getSubtotal())
             );
             $baseCurrencyCode = Mage::app()->getWebsite($rawRequest->getWebsiteId())->getBaseCurrencyCode();
             $nodeDutiable->addChild('DeclaredCurrency', $baseCurrencyCode);
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/Label/Pdf/PageBuilder.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/Label/Pdf/PageBuilder.php
index f8e83f80c7a4..4c1de7f7ca24 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/Label/Pdf/PageBuilder.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Dhl/Label/Pdf/PageBuilder.php
@@ -194,7 +194,7 @@ public function addProductContentCode($code)
                 $this->_y(28),
                 Zend_Pdf_Page::SHAPE_DRAW_FILL
             );
-            $this->_page->setFillColor(new Zend_Pdf_Color_Html("#ffffff"));
+            $this->_page->setFillColor(new Zend_Pdf_Color_Html('#ffffff'));
             $font = $this->_fontBold;
         } else {
             $font = $this->_fontNormal;
@@ -258,7 +258,7 @@ public function addSenderInfo(SimpleXMLElement $sender)
 
         $phoneNumber = implode(' ', array_filter([(string)$sender->Contact->PhoneNumber,
             (string)$sender->Contact->PhoneExtension]));
-        $phoneNumber = $phoneNumber ? "Phone: " . $phoneNumber : '';
+        $phoneNumber = $phoneNumber ? 'Phone: ' . $phoneNumber : '';
         $pageY = $this->_drawSenderAddress($sender->AddressLine, $phoneNumber);
 
         $divisionCode = (string)(strlen($sender->DivisionCode) ? $sender->DivisionCode . ' ' : null);
@@ -325,7 +325,7 @@ public function addOriginInfo($serviceAreaCode)
         }
         $this->_page->saveGS();
         $this->_page->setFont($this->_fontNormal, 6);
-        $this->_page->drawText("Origin:", $this->_x(260), $this->_y(36));
+        $this->_page->drawText('Origin:', $this->_x(260), $this->_y(36));
         $this->_page->setFont($this->_fontBold, 9);
         $this->_page->drawText($serviceAreaCode, $this->_x(260), $this->_y(45));
 
@@ -344,7 +344,7 @@ public function addReceiveInfo(SimpleXMLElement $consignee)
         $this->_page->saveGS();
 
         $this->_page->setFont($this->_fontNormal, 9);
-        $this->_page->drawText("To:", $this->_x(5), $this->_y(92));
+        $this->_page->drawText('To:', $this->_x(5), $this->_y(92));
         $this->_page->drawText($consignee->CompanyName, $this->_x(20), $this->_y(90));
         $y = $this->_page->drawLines($consignee->AddressLine, $this->_x(19), $this->_y(100), 50);
 
@@ -500,7 +500,7 @@ public function addWeightInfo($weight, $unit)
     {
         $this->_page->saveGS();
 
-        $units = ["K" => 'kg', "L" => 'lb'];
+        $units = ['K' => 'kg', 'L' => 'lb'];
         if (!isset($units[$unit])) {
             throw new InvalidArgumentException(Mage::helper('usa')->__('Weight unit is invalid'));
         }
@@ -560,12 +560,12 @@ public function addWaybillBarcode($number, $barCode)
         if (!strlen($number) || !strlen($barCode)) {
             throw new InvalidArgumentException(Mage::helper('usa')->__('Waybill barcode information is missing'));
         }
-        $image = new Zend_Pdf_Resource_Image_Png("data://image/png;base64," . $barCode);
+        $image = new Zend_Pdf_Resource_Image_Png('data://image/png;base64,' . $barCode);
         $this->_page->drawImage($image, $this->_x(0), $this->_y(296), $this->_x(232), $this->_y(375));
 
         $this->_page->setFont($this->_fontNormal, 9);
         $number = substr($number, 0, 2) . ' ' . substr($number, 2, 4) . ' ' . substr($number, 6, 4);
-        $this->_page->drawText("WAYBILL " . $number, $this->_x(13.5), $this->_y(382));
+        $this->_page->drawText('WAYBILL ' . $number, $this->_x(13.5), $this->_y(382));
 
         $this->_page->restoreGS();
         return $this;
@@ -588,7 +588,7 @@ public function addRoutingBarcode($routingCode, $id, $barCode)
             throw new InvalidArgumentException(Mage::helper('usa')->__('Routing barcode is missing'));
         }
 
-        $image = new Zend_Pdf_Resource_Image_Png("data://image/png;base64," . $barCode);
+        $image = new Zend_Pdf_Resource_Image_Png('data://image/png;base64,' . $barCode);
         $this->_page->drawImage($image, $this->_x(0), $this->_y(386), $this->_x(232), $this->_y(465));
 
         $this->_page->setFont($this->_fontNormal, 9);
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Fedex.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Fedex.php
index ee3bdb4ce148..fc52347002fd 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Fedex.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Fedex.php
@@ -480,7 +480,7 @@ protected function _prepareRateResponse($response)
                     $errorTitle = (string)$response->Notifications->Message;
                 }
             } elseif (isset($response->RateReplyDetails)) {
-                $allowedMethods = explode(",", $this->getConfigData('allowed_methods'));
+                $allowedMethods = explode(',', $this->getConfigData('allowed_methods'));
 
                 if (is_array($response->RateReplyDetails)) {
                     foreach ($response->RateReplyDetails as $rate) {
@@ -686,7 +686,7 @@ protected function _parseXmlResponse($response)
                     $errorTitle = 'Unknown error';
                 }
 
-                $allowedMethods = explode(",", $this->getConfigData('allowed_methods'));
+                $allowedMethods = explode(',', $this->getConfigData('allowed_methods'));
 
                 foreach ($xml->Entry as $entry) {
                     if (in_array((string)$entry->Service, $allowedMethods)) {
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Ups.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Ups.php
index 61090b27a622..acf390d23979 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/Ups.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/Ups.php
@@ -507,11 +507,11 @@ public function getCode($type, $code = '')
             ],
 
             'pickup' => [
-                'RDP'    => ["label" => 'Regular Daily Pickup',"code" => "01"],
-                'OCA'    => ["label" => 'On Call Air',"code" => "07"],
-                'OTP'    => ["label" => 'One Time Pickup',"code" => "06"],
-                'LC'     => ["label" => 'Letter Center',"code" => "19"],
-                'CC'     => ["label" => 'Customer Counter',"code" => "03"],
+                'RDP'    => ['label' => 'Regular Daily Pickup','code' => '01'],
+                'OCA'    => ['label' => 'On Call Air','code' => '07'],
+                'OTP'    => ['label' => 'One Time Pickup','code' => '06'],
+                'LC'     => ['label' => 'Letter Center','code' => '19'],
+                'CC'     => ['label' => 'Customer Counter','code' => '03'],
             ],
 
             'container' => [
@@ -711,10 +711,10 @@ protected function _getXmlQuotes()
 XMLRequest;
 
         if ($params['serviceCode'] !== null) {
-            $xmlRequest .= "<Service>" .
+            $xmlRequest .= '<Service>' .
                 "<Code>{$params['serviceCode']}</Code>" .
                 "<Description>{$params['serviceDescription']}</Description>" .
-                "</Service>";
+                '</Service>';
         }
 
         $xmlRequest .= <<< XMLRequest
@@ -781,7 +781,7 @@ protected function _getXmlQuotes()
     </Package>
 XMLRequest;
         if ($this->getConfigFlag('negotiated_active')) {
-            $xmlRequest .= "<RateInformation><NegotiatedRatesIndicator/></RateInformation>";
+            $xmlRequest .= '<RateInformation><NegotiatedRatesIndicator/></RateInformation>';
         }
 
         $xmlRequest .= <<< XMLRequest
@@ -845,14 +845,14 @@ protected function _parseXmlResponse($xmlResponse)
         if (strlen(trim($xmlResponse)) > 0) {
             $xml = new Varien_Simplexml_Config();
             $xml->loadString($xmlResponse);
-            $arr = $xml->getXpath("//RatingServiceSelectionResponse/Response/ResponseStatusCode/text()");
+            $arr = $xml->getXpath('//RatingServiceSelectionResponse/Response/ResponseStatusCode/text()');
             $success = (int)$arr[0];
             if ($success === 1) {
-                $arr = $xml->getXpath("//RatingServiceSelectionResponse/RatedShipment");
-                $allowedMethods = explode(",", $this->getConfigData('allowed_methods'));
+                $arr = $xml->getXpath('//RatingServiceSelectionResponse/RatedShipment');
+                $allowedMethods = explode(',', $this->getConfigData('allowed_methods'));
 
                 // Negotiated rates
-                $negotiatedArr = $xml->getXpath("//RatingServiceSelectionResponse/RatedShipment/NegotiatedRates");
+                $negotiatedArr = $xml->getXpath('//RatingServiceSelectionResponse/RatedShipment/NegotiatedRates');
                 $negotiatedActive = $this->getConfigFlag('negotiated_active')
                     && $this->getConfigData('shipper_number')
                     && !empty($negotiatedArr);
@@ -891,7 +891,7 @@ protected function _parseXmlResponse($xmlResponse)
                     }
                 }
             } else {
-                $arr = $xml->getXpath("//RatingServiceSelectionResponse/Response/Error/ErrorDescription/text()");
+                $arr = $xml->getXpath('//RatingServiceSelectionResponse/Response/Error/ErrorDescription/text()');
                 $errorTitle = (string)$arr[0][0];
                 $error = Mage::getModel('shipping/rate_result_error');
                 $error->setCarrier('ups');
@@ -1045,25 +1045,25 @@ protected function _parseXmlTrackingResponse($trackingvalue, $xmlResponse)
         if ($xmlResponse) {
             $xml = new Varien_Simplexml_Config();
             $xml->loadString($xmlResponse);
-            $arr = $xml->getXpath("//TrackResponse/Response/ResponseStatusCode/text()");
+            $arr = $xml->getXpath('//TrackResponse/Response/ResponseStatusCode/text()');
             $success = (int)$arr[0][0];
 
             if ($success === 1) {
-                $arr = $xml->getXpath("//TrackResponse/Shipment/Service/Description/text()");
+                $arr = $xml->getXpath('//TrackResponse/Shipment/Service/Description/text()');
                 $resultArr['service'] = (string)$arr[0];
 
-                $arr = $xml->getXpath("//TrackResponse/Shipment/PickupDate/text()");
+                $arr = $xml->getXpath('//TrackResponse/Shipment/PickupDate/text()');
                 $resultArr['shippeddate'] = (string)$arr[0];
 
-                $arr = $xml->getXpath("//TrackResponse/Shipment/Package/PackageWeight/Weight/text()");
+                $arr = $xml->getXpath('//TrackResponse/Shipment/Package/PackageWeight/Weight/text()');
                 $weight = (string)$arr[0];
 
-                $arr = $xml->getXpath("//TrackResponse/Shipment/Package/PackageWeight/UnitOfMeasurement/Code/text()");
+                $arr = $xml->getXpath('//TrackResponse/Shipment/Package/PackageWeight/UnitOfMeasurement/Code/text()');
                 $unit = (string)$arr[0];
 
                 $resultArr['weight'] = "{$weight} {$unit}";
 
-                $activityTags = $xml->getXpath("//TrackResponse/Shipment/Package/Activity");
+                $activityTags = $xml->getXpath('//TrackResponse/Shipment/Package/Activity');
                 if ($activityTags) {
                     $i = 1;
                     foreach ($activityTags as $activityTag) {
@@ -1113,7 +1113,7 @@ protected function _parseXmlTrackingResponse($trackingvalue, $xmlResponse)
                     $resultArr['progressdetail'] = $packageProgress;
                 }
             } else {
-                $arr = $xml->getXpath("//TrackResponse/Response/Error/ErrorDescription/text()");
+                $arr = $xml->getXpath('//TrackResponse/Response/Error/ErrorDescription/text()');
                 $errorTitle = (string)$arr[0][0];
             }
         }
@@ -1147,7 +1147,7 @@ protected function _getRestTracking($trackings)
             return $this->_trackingResult;
         }
 
-        $version = "v1";
+        $version = 'v1';
         $query = http_build_query([
             'locale' => 'en_US',
             'returnSignature' => 'false',
@@ -1654,7 +1654,7 @@ protected function _doShipmentRequestRest(Varien_Object $request): Varien_Object
         /** Rest API Payload */
         $headers = [
             "Authorization: Bearer $accessToken",
-            "Content-Type: application/json"
+            'Content-Type: application/json'
         ];
         $debugData = [
             'request' => $rawJsonRequest
@@ -1764,25 +1764,25 @@ protected function _formShipmentRestRequest(Varien_Object $request): string
 
         /**  Shipment API Payload */
         $shipParams = [
-            "ShipmentRequest" => [
-                "Request" => [
-                    "SubVersion" => "1801",
-                    "RequestOption" => "nonvalidate",
-                    "TransactionReference" => [
-                        "CustomerContext" => "Shipment Request"
+            'ShipmentRequest' => [
+                'Request' => [
+                    'SubVersion' => '1801',
+                    'RequestOption' => 'nonvalidate',
+                    'TransactionReference' => [
+                        'CustomerContext' => 'Shipment Request'
                     ]
                 ],
-                "Shipment" => [
-                    "Description" => $shipmentDescription,
-                    "Shipper" => [],
-                    "ShipTo" => [],
-                    "ShipFrom" => [],
-                    "PaymentInformation" => [],
-                    "Service" => [],
-                    "Package" => [],
-                    "ShipmentServiceOptions" => []
+                'Shipment' => [
+                    'Description' => $shipmentDescription,
+                    'Shipper' => [],
+                    'ShipTo' => [],
+                    'ShipFrom' => [],
+                    'PaymentInformation' => [],
+                    'Service' => [],
+                    'Package' => [],
+                    'ShipmentServiceOptions' => []
                 ],
-                "LabelSpecification" => []
+                'LabelSpecification' => []
             ]
         ];
         if ($request->getIsReturn()) {
@@ -1914,7 +1914,7 @@ protected function _formShipmentRestRequest(Varien_Object $request): string
                 = $deliveryConfirmation;
         }
 
-        $shipParams['ShipmentRequest']['Shipment']['PaymentInformation']['ShipmentCharge']['Type'] = "01";
+        $shipParams['ShipmentRequest']['Shipment']['PaymentInformation']['ShipmentCharge']['Type'] = '01';
         $shipParams['ShipmentRequest']['Shipment']['PaymentInformation']['ShipmentCharge']['BillShipper']
         ['AccountNumber'] = $this->getConfigData('shipper_number');
 
@@ -2204,38 +2204,38 @@ protected function _getRestQuotes()
         }
 
         $rateParams = [
-            "RateRequest" => [
-                "Request" => [
-                    "TransactionReference" => [
-                        "CustomerContext" => "Rating and Service"
+            'RateRequest' => [
+                'Request' => [
+                    'TransactionReference' => [
+                        'CustomerContext' => 'Rating and Service'
                     ]
                 ],
-                "Shipment" => [
-                    "Shipper" => [
-                        "Name" => "UPS",
-                        "ShipperNumber" => "{$shipperNumber}",
-                        "Address" => [
-                            "AddressLine" => [],
-                            "City" => "{$shipperCity}",
-                            "StateProvinceCode" => "{$shipperStateProvince}",
-                            "PostalCode" => "{$shipperPostalCode}",
-                            "CountryCode" => "{$shipperCountryCode}"
+                'Shipment' => [
+                    'Shipper' => [
+                        'Name' => 'UPS',
+                        'ShipperNumber' => "{$shipperNumber}",
+                        'Address' => [
+                            'AddressLine' => [],
+                            'City' => "{$shipperCity}",
+                            'StateProvinceCode' => "{$shipperStateProvince}",
+                            'PostalCode' => "{$shipperPostalCode}",
+                            'CountryCode' => "{$shipperCountryCode}"
                         ]
                     ],
-                    "ShipTo" => [
-                        "Address" => [
-                            "AddressLine" => ["{$params['49_residential']}"],
-                            "StateProvinceCode" => "{$params['destRegionCode']}",
-                            "PostalCode" => "{$params['19_destPostal']}",
-                            "CountryCode" => "{$params['22_destCountry']}"
+                    'ShipTo' => [
+                        'Address' => [
+                            'AddressLine' => ["{$params['49_residential']}"],
+                            'StateProvinceCode' => "{$params['destRegionCode']}",
+                            'PostalCode' => "{$params['19_destPostal']}",
+                            'CountryCode' => "{$params['22_destCountry']}"
                         ]
                     ],
-                    "ShipFrom" => [
-                        "Address" => [
-                            "AddressLine" => [],
-                            "StateProvinceCode" => "{$params['origRegionCode']}",
-                            "PostalCode" => "{$params['15_origPostal']}",
-                            "CountryCode" => "{$params['14_origCountry']}"
+                    'ShipFrom' => [
+                        'Address' => [
+                            'AddressLine' => [],
+                            'StateProvinceCode' => "{$params['origRegionCode']}",
+                            'PostalCode' => "{$params['15_origPostal']}",
+                            'CountryCode' => "{$params['14_origCountry']}"
                         ]
                     ],
                 ]
@@ -2247,11 +2247,11 @@ protected function _getRestQuotes()
         }
 
         if ($this->getConfigFlag('negotiated_active')) {
-            $rateParams['RateRequest']['Shipment']['ShipmentRatingOptions']['TPFCNegotiatedRatesIndicator'] = "Y";
-            $rateParams['RateRequest']['Shipment']['ShipmentRatingOptions']['NegotiatedRatesIndicator'] = "Y";
+            $rateParams['RateRequest']['Shipment']['ShipmentRatingOptions']['TPFCNegotiatedRatesIndicator'] = 'Y';
+            $rateParams['RateRequest']['Shipment']['ShipmentRatingOptions']['NegotiatedRatesIndicator'] = 'Y';
         }
         if ($this->getConfigFlag('include_taxes')) {
-            $rateParams['RateRequest']['Shipment']['TaxInformationIndicator'] = "Y";
+            $rateParams['RateRequest']['Shipment']['TaxInformationIndicator'] = 'Y';
         }
 
         if ($serviceCode !== null) {
@@ -2260,41 +2260,41 @@ protected function _getRestQuotes()
         }
 
         $rateParams['RateRequest']['Shipment']['Package'][] = [
-            "PackagingType" => [
-                "Code" => "{$params['48_container']}",
-                "Description" => "Packaging"
+            'PackagingType' => [
+                'Code' => "{$params['48_container']}",
+                'Description' => 'Packaging'
             ],
-            "Dimensions" => [
-                "UnitOfMeasurement" => [
-                    "Code" => $rowRequest->getUnitDimensions(),
-                    "Description" => $rowRequest->getUnitDimensionsDescription()
+            'Dimensions' => [
+                'UnitOfMeasurement' => [
+                    'Code' => $rowRequest->getUnitDimensions(),
+                    'Description' => $rowRequest->getUnitDimensionsDescription()
                 ],
-                "Length" => "5",
-                "Width" => "5",
-                "Height" => "5"
+                'Length' => '5',
+                'Width' => '5',
+                'Height' => '5'
             ],
-            "PackageWeight" => [
-                "UnitOfMeasurement" => [
-                    "Code" => "{$rowRequest->getUnitMeasure()}"
+            'PackageWeight' => [
+                'UnitOfMeasurement' => [
+                    'Code' => "{$rowRequest->getUnitMeasure()}"
                 ],
-                "Weight" => "{$params['23_weight']}"
+                'Weight' => "{$params['23_weight']}"
             ]
         ];
 
         $ratePayload = json_encode($rateParams, JSON_PRETTY_PRINT);
         /** Rest API Payload */
-        $version = "v1";
+        $version = 'v1';
         $requestOption = $params['10_action'];
         $headers = [
             "Authorization: Bearer $accessToken",
-            "Content-Type: application/json"
+            'Content-Type: application/json'
         ];
         $debugData = [
             'request' => $ratePayload
         ];
 
         $ch = curl_init();
-        curl_setopt($ch, CURLOPT_URL, $url . $version . "/" . $requestOption);
+        curl_setopt($ch, CURLOPT_URL, $url . $version . '/' . $requestOption);
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt($ch, CURLOPT_HEADER, 0);
         curl_setopt($ch, CURLOPT_POST, 1);
@@ -2332,7 +2332,7 @@ protected function _parseRestResponse(string $rateResponse)
                     // Handling cases where a single service is returned by UPS
                     $arr = [$arr];
                 }
-                $allowedMethods = explode(",", $this->getConfigData('allowed_methods') ?? '');
+                $allowedMethods = explode(',', $this->getConfigData('allowed_methods') ?? '');
                 $allowedCurrencies = Mage::getModel('directory/currency')->getConfigAllowCurrencies();
                 foreach ($arr as $shipElement) {
                     $negotiatedArr = $shipElement['NegotiatedRateCharges'] ?? [] ;
diff --git a/app/code/core/Mage/Usa/Model/Shipping/Carrier/UpsAuth.php b/app/code/core/Mage/Usa/Model/Shipping/Carrier/UpsAuth.php
index 90ea30540f87..d8d974ea6adc 100644
--- a/app/code/core/Mage/Usa/Model/Shipping/Carrier/UpsAuth.php
+++ b/app/code/core/Mage/Usa/Model/Shipping/Carrier/UpsAuth.php
@@ -40,9 +40,9 @@ public function getAccessToken(string $clientId, string $clientSecret, string $c
         }
 
         $headers = [
-            "Content-Type: application/x-www-form-urlencoded",
+            'Content-Type: application/x-www-form-urlencoded',
             "x-merchant-id: $clientId",
-            "Authorization: Basic " . base64_encode("$clientId:$clientSecret"),
+            'Authorization: Basic ' . base64_encode("$clientId:$clientSecret"),
         ];
         $authPayload = http_build_query([
             'grant_type' => 'client_credentials',
diff --git a/app/code/core/Mage/Weee/Block/Renderer/Weee/Tax.php b/app/code/core/Mage/Weee/Block/Renderer/Weee/Tax.php
index d829f18eb76d..782dd078cc4b 100644
--- a/app/code/core/Mage/Weee/Block/Renderer/Weee/Tax.php
+++ b/app/code/core/Mage/Weee/Block/Renderer/Weee/Tax.php
@@ -215,7 +215,7 @@ protected function _setAddButton()
         $this->setChild(
             'add_button',
             $this->getLayout()->createBlock('adminhtml/widget_button')
-                ->setData(['id' => "add_tax_" . $this->getElement()->getHtmlId(),
+                ->setData(['id' => 'add_tax_' . $this->getElement()->getHtmlId(),
                 'label' => Mage::helper('catalog')->__('Add Tax'),
                 'onclick' => "weeeTaxControl.addItem('" . $this->getElement()->getHtmlId() . "')",
                 'class' => 'add'
diff --git a/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.11-0.12.php b/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.11-0.12.php
index 68ec97e9966a..422683d77797 100644
--- a/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.11-0.12.php
+++ b/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.11-0.12.php
@@ -17,7 +17,7 @@
 $installer = $this;
 $installer->startSetup();
 
-$installer->getConnection()->addColumn($installer->getTable('weee_tax'), 'entity_type_id', "smallint (5) unsigned not null");
+$installer->getConnection()->addColumn($installer->getTable('weee_tax'), 'entity_type_id', 'smallint (5) unsigned not null');
 $installer->run("
 UPDATE
     `{$installer->getTable('weee_tax')}`
diff --git a/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.2-0.3.php b/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.2-0.3.php
index 2bf0bce692cd..1f183bf6d9f1 100644
--- a/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.2-0.3.php
+++ b/app/code/core/Mage/Weee/sql/weee_setup/mysql4-upgrade-0.2-0.3.php
@@ -17,6 +17,6 @@
 $installer = $this;
 $installer->startSetup();
 
-$installer->getConnection()->addColumn($installer->getTable('weee_tax'), 'attribute_id', "smallint (5) unsigned not null");
+$installer->getConnection()->addColumn($installer->getTable('weee_tax'), 'attribute_id', 'smallint (5) unsigned not null');
 
 $installer->endSetup();
diff --git a/app/code/core/Mage/Widget/Model/Widget.php b/app/code/core/Mage/Widget/Model/Widget.php
index 9a8e51ef8ba5..e87a55094787 100644
--- a/app/code/core/Mage/Widget/Model/Widget.php
+++ b/app/code/core/Mage/Widget/Model/Widget.php
@@ -195,7 +195,7 @@ public function getWidgetsArray($filters = [])
                     'description'   => $helper->__((string)$widget->description)
                 ];
             }
-            usort($result, [$this, "_sortWidgets"]);
+            usort($result, [$this, '_sortWidgets']);
             $this->setData('widgets_array', $result);
         }
         return $this->_getData('widgets_array');
diff --git a/app/code/core/Mage/Wishlist/controllers/IndexController.php b/app/code/core/Mage/Wishlist/controllers/IndexController.php
index ec358ecef3c4..29cfc35b4728 100644
--- a/app/code/core/Mage/Wishlist/controllers/IndexController.php
+++ b/app/code/core/Mage/Wishlist/controllers/IndexController.php
@@ -586,7 +586,7 @@ public function fromcartAction()
             $productName = Mage::helper('core')->escapeHtml($item->getProduct()->getName());
             $wishlistName = Mage::helper('core')->escapeHtml($wishlist->getName());
             $session->addSuccess(
-                Mage::helper('wishlist')->__("%s has been moved to wishlist %s", $productName, $wishlistName)
+                Mage::helper('wishlist')->__('%s has been moved to wishlist %s', $productName, $wishlistName)
             );
             $wishlist->save();
         } catch (Mage_Core_Exception $e) {
diff --git a/lib/Mage/Archive/Helper/File.php b/lib/Mage/Archive/Helper/File.php
index 928d9eed77ea..88a772d532fb 100644
--- a/lib/Mage/Archive/Helper/File.php
+++ b/lib/Mage/Archive/Helper/File.php
@@ -95,7 +95,7 @@ public function open($mode = 'w+', $chmod = 0666)
             }
 
             if (is_file($this->_filePath) && !is_writable($this->_filePath)) {
-                throw new Mage_Exception("Can't open file " . $this->_fileName . " for writing. Permission denied.");
+                throw new Mage_Exception("Can't open file " . $this->_fileName . ' for writing. Permission denied.');
             }
         }
 
diff --git a/lib/Mage/Archive/Tar.php b/lib/Mage/Archive/Tar.php
index afc48a9fc67c..443d0746d870 100644
--- a/lib/Mage/Archive/Tar.php
+++ b/lib/Mage/Archive/Tar.php
@@ -362,12 +362,12 @@ protected function _composeHeader($long = false)
         $header = [];
         $header['100-name']       = $long ? '././@LongLink' : substr($nameFile, 0, 100);
         $header['8-mode']         = $long ? '       '
-            : str_pad(substr(sprintf("%07o", $infoFile['mode']), -4), 6, '0', STR_PAD_LEFT);
-        $header['8-uid']          = $long || $infoFile['uid'] == 0 ? "\0\0\0\0\0\0\0" : sprintf("%07o", $infoFile['uid']);
-        $header['8-gid']          = $long || $infoFile['gid'] == 0 ? "\0\0\0\0\0\0\0" : sprintf("%07o", $infoFile['gid']);
-        $header['12-size']        = $long ? sprintf("%011o", strlen($nameFile)) : sprintf("%011o", is_dir($file)
+            : str_pad(substr(sprintf('%07o', $infoFile['mode']), -4), 6, '0', STR_PAD_LEFT);
+        $header['8-uid']          = $long || $infoFile['uid'] == 0 ? "\0\0\0\0\0\0\0" : sprintf('%07o', $infoFile['uid']);
+        $header['8-gid']          = $long || $infoFile['gid'] == 0 ? "\0\0\0\0\0\0\0" : sprintf('%07o', $infoFile['gid']);
+        $header['12-size']        = $long ? sprintf('%011o', strlen($nameFile)) : sprintf('%011o', is_dir($file)
             ? 0 : filesize($file));
-        $header['12-mtime']       = $long ? '00000000000' : sprintf("%011o", $infoFile['mtime']);
+        $header['12-mtime']       = $long ? '00000000000' : sprintf('%011o', $infoFile['mtime']);
         $header['8-check']        = sprintf('% 8s', '');
         $header['1-type']         = $long ? 'L' : (is_link($file) ? 2 : (is_dir($file) ? 5 : 0));
         $header['100-symlink']    = is_link($file) ? readlink($file) : '';
@@ -392,7 +392,7 @@ protected function _composeHeader($long = false)
         for ($i = 0; $i < 512; $i++) {
             $checksum += ord(substr($packedHeader, $i, 1));
         }
-        $packedHeader = substr_replace($packedHeader, sprintf("%07o", $checksum) . "\0", 148, 8);
+        $packedHeader = substr_replace($packedHeader, sprintf('%07o', $checksum) . "\0", 148, 8);
 
         return $longHeader . $packedHeader;
     }
@@ -423,7 +423,7 @@ protected function _unpackCurrentTar($destination)
             $currentFile = $destination . $header['name'];
             $dirname = dirname($currentFile);
 
-            if (in_array($header['type'], ["0",chr(0), ''])) {
+            if (in_array($header['type'], ['0',chr(0), ''])) {
                 if (!file_exists($dirname)) {
                     $mkdirResult = @mkdir($dirname, 0777, true);
 
@@ -477,7 +477,7 @@ protected function _parseHeader(&$pointer)
         $header['mtime'] = octdec($header['mtime']);
         $header['checksum'] = octdec($header['checksum']);
 
-        if ($header['type'] == "5") {
+        if ($header['type'] == '5') {
             $header['size'] = 0;
         }
 
@@ -532,7 +532,7 @@ protected function _extractFileHeader()
         $header['mtime']    = octdec($header['mtime']);
         $header['checksum'] = octdec($header['checksum']);
 
-        if ($header['type'] == "5") {
+        if ($header['type'] == '5') {
             $header['size'] = 0;
         }
 
diff --git a/lib/Mage/DB/Mysqli.php b/lib/Mage/DB/Mysqli.php
index ffb86bd3d01c..f987ddaf3f19 100644
--- a/lib/Mage/DB/Mysqli.php
+++ b/lib/Mage/DB/Mysqli.php
@@ -340,11 +340,11 @@ public function unsafeQuery($sql)
     public function insertAssocOne($table, array $data, $replace = false)
     {
         $keys = $this->escapeFieldNames(array_keys($data));
-        $keys = "(" . implode(",", $keys) . ")";
+        $keys = '(' . implode(',', $keys) . ')';
         $table = $this->escapeTableName($table);
         $sql = $replace ? "REPLACE INTO {$table} " : "INSERT INTO {$table} ";
         $values = $this->escapeFieldValues(array_values($data));
-        $values = " VALUES (" . implode(",", $values) . ")";
+        $values = ' VALUES (' . implode(',', $values) . ')';
         $sql .= $keys . $values;
         return $this->query($sql);
     }
@@ -371,30 +371,30 @@ public function insertAssocMultiple($table, array $data, $replace = false, $excl
         }
 
         $keys = $this->escapeFieldNames($keys);
-        $sql .= " ( ";
+        $sql .= ' ( ';
         for ($i = 0, $c = count($keys); $i < $c; $i++) {
             $sql .= $keys[$i];
             if ($i != $c - 1) {
-                $sql .= ",";
+                $sql .= ',';
             }
         }
-        $sql .= " ) VALUES ";
+        $sql .= ' ) VALUES ';
         for ($i = 0, $c = count($data); $i < $c; $i++) {
             $row = $data[$i];
             for ($j = 0, $jc = count($excluded); $j < $jc; $j++) {
                 unset($data[$excluded[$j]]);
             }
             $values = $this->escapeFieldValues(array_values($row));
-            $sql .= "( ";
+            $sql .= '( ';
             for ($j = 0, $jc = count($values); $j < $jc; $j++) {
                 $sql .= $values[$j];
                 if ($j != $jc - 1) {
-                    $sql .= ",";
+                    $sql .= ',';
                 }
             }
-            $sql .= " )";
+            $sql .= ' )';
             if ($i != $c - 1) {
-                $sql .= ",";
+                $sql .= ',';
             }
         }
         return $this->query($sql);
@@ -414,9 +414,9 @@ public function updateAssoc($table, array $data, $condition = '1=1')
         foreach ($data as $k => $v) {
             $k = $this->escapeFieldName($k);
             $v = $this->escapeFieldValue($v);
-            $set[] = $k . " = " . $v;
+            $set[] = $k . ' = ' . $v;
         }
-        $set = implode(",", $set);
+        $set = implode(',', $set);
         $sql = "UPDATE {$table} SET {$set} WHERE {$condition}";
         return $this->query($sql);
     }
@@ -438,9 +438,9 @@ public function updateAssocByKey($table, array $data, $value, $key = 'id')
         foreach ($data as $k => $v) {
             $k = $this->escapeFieldName($k);
             $v = $this->escapeFieldValue($v);
-            $set[] = $k . " = " . $v;
+            $set[] = $k . ' = ' . $v;
         }
-        $set = implode(",", $set);
+        $set = implode(',', $set);
         $sql = "UPDATE {$table} SET {$set} WHERE {$key} = {$value}";
         return $this->query($sql);
     }
@@ -459,7 +459,7 @@ public function idsToString($ids)
         foreach ($ids as $id) {
             $out .= $this->escapeFieldValue($id);
         }
-        return implode(",", $out);
+        return implode(',', $out);
     }
 
     /**
@@ -508,7 +508,7 @@ public function simpleCount($table, $condition)
 
     public function lastInsertId()
     {
-        $sql = "SELECT LAST_INSERT_ID() as `id`";
+        $sql = 'SELECT LAST_INSERT_ID() as `id`';
         $data = $this->fetchOne($sql);
         return $data['id'];
     }
diff --git a/lib/Mage/HTTP/Client.php b/lib/Mage/HTTP/Client.php
index a7ec0641b468..b9a3f397be01 100644
--- a/lib/Mage/HTTP/Client.php
+++ b/lib/Mage/HTTP/Client.php
@@ -40,10 +40,10 @@ public static function getInstance($frontend = false)
             $frontend = self::detectFrontend();
         }
         if (false === $frontend) {
-            throw new Exception("Cannot find frontend automatically, set it manually");
+            throw new Exception('Cannot find frontend automatically, set it manually');
         }
 
-        $class = __CLASS__ . "_" . str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $frontend)));
+        $class = __CLASS__ . '_' . str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $frontend)));
         $obj = new $class();
         return $obj;
     }
@@ -56,11 +56,11 @@ public static function getInstance($frontend = false)
      */
     protected static function detectFrontend()
     {
-        if (function_exists("curl_init")) {
-            return "curl";
+        if (function_exists('curl_init')) {
+            return 'curl';
         }
-        if (function_exists("fsockopen")) {
-            return "socket";
+        if (function_exists('fsockopen')) {
+            return 'socket';
         }
         return false;
     }
diff --git a/lib/Mage/HTTP/Client/Curl.php b/lib/Mage/HTTP/Client/Curl.php
index 6cef1705467e..57edac17b35d 100644
--- a/lib/Mage/HTTP/Client/Curl.php
+++ b/lib/Mage/HTTP/Client/Curl.php
@@ -166,7 +166,7 @@ public function removeHeader($name)
     public function setCredentials($login, $pass)
     {
         $val = base64_encode("$login:$pass");
-        $this->addHeader("Authorization", "Basic $val");
+        $this->addHeader('Authorization', "Basic $val");
     }
 
     /**
@@ -215,7 +215,7 @@ public function removeCookies()
      */
     public function get($uri)
     {
-        $this->makeRequest("GET", $uri);
+        $this->makeRequest('GET', $uri);
     }
 
     /**
@@ -224,7 +224,7 @@ public function get($uri)
      */
     public function post($uri, $params)
     {
-        $this->makeRequest("POST", $uri, $params);
+        $this->makeRequest('POST', $uri, $params);
     }
 
     /**
@@ -259,7 +259,7 @@ public function getCookies()
         }
         $out = [];
         foreach ($this->_responseHeaders['Set-Cookie'] as $row) {
-            $values = explode("; ", $row);
+            $values = explode('; ', $row);
             $c = count($values);
             if (!$c) {
                 continue;
@@ -285,7 +285,7 @@ public function getCookiesFull()
         }
         $out = [];
         foreach ($this->_responseHeaders['Set-Cookie'] as $row) {
-            $values = explode("; ", $row);
+            $values = explode('; ', $row);
             $c = count($values);
             if (!$c) {
                 continue;
@@ -301,7 +301,7 @@ public function getCookiesFull()
                 continue;
             }
             for ($i = 0; $i < $c; $i++) {
-                list($subkey, $val) = explode("=", $values[$i]);
+                list($subkey, $val) = explode('=', $values[$i]);
                 $out[trim($key)][trim($subkey)] = trim($val);
             }
         }
@@ -330,7 +330,7 @@ protected function makeRequest($method, $uri, $params = [])
         if ($method == 'POST') {
             $this->curlOption(CURLOPT_POST, 1);
             $this->curlOption(CURLOPT_POSTFIELDS, is_array($params) ? http_build_query($params) : $params);
-        } elseif ($method == "GET") {
+        } elseif ($method == 'GET') {
             $this->curlOption(CURLOPT_HTTPGET, 1);
         } else {
             $this->curlOption(CURLOPT_CUSTOMREQUEST, $method);
@@ -349,7 +349,7 @@ protected function makeRequest($method, $uri, $params = [])
             foreach ($this->_cookies as $k => $v) {
                 $cookies[] = "$k=$v";
             }
-            $this->curlOption(CURLOPT_COOKIE, implode(";", $cookies));
+            $this->curlOption(CURLOPT_COOKIE, implode(';', $cookies));
         }
 
         if ($this->_timeout) {
diff --git a/lib/Mage/HTTP/Client/Socket.php b/lib/Mage/HTTP/Client/Socket.php
index 421b426bde83..e0cd7ef6977d 100644
--- a/lib/Mage/HTTP/Client/Socket.php
+++ b/lib/Mage/HTTP/Client/Socket.php
@@ -172,7 +172,7 @@ public function removeHeader($name)
     public function setCredentials($login, $pass)
     {
         $val = base64_encode("$login:$pass");
-        $this->addHeader("Authorization", "Basic $val");
+        $this->addHeader('Authorization', "Basic $val");
     }
 
     /**
@@ -221,7 +221,7 @@ public function removeCookies()
      */
     public function get($uri)
     {
-        $this->makeRequest("GET", $this->parseUrl($uri));
+        $this->makeRequest('GET', $this->parseUrl($uri));
     }
 
     /**
@@ -253,7 +253,7 @@ protected function parseUrl($uri)
             throw new InvalidArgumentException("Uri doesn't contain path part");
         }
         if (!empty($parts['query'])) {
-            $requestUri .= "?" . $parts['query'];
+            $requestUri .= '?' . $parts['query'];
         }
         return $requestUri;
     }
@@ -263,7 +263,7 @@ protected function parseUrl($uri)
      */
     public function post($uri, $params)
     {
-        $this->makeRequest("POST", $this->parseUrl($uri), $params);
+        $this->makeRequest('POST', $this->parseUrl($uri), $params);
     }
 
     /**
@@ -298,7 +298,7 @@ public function getCookies()
         }
         $out = [];
         foreach ($this->_responseHeaders['Set-Cookie'] as $row) {
-            $values = explode("; ", $row);
+            $values = explode('; ', $row);
             $c = count($values);
             if (!$c) {
                 continue;
@@ -324,7 +324,7 @@ public function getCookiesFull()
         }
         $out = [];
         foreach ($this->_responseHeaders['Set-Cookie'] as $row) {
-            $values = explode("; ", $row);
+            $values = explode('; ', $row);
             $c = count($values);
             if (!$c) {
                 continue;
@@ -340,7 +340,7 @@ public function getCookiesFull()
                 continue;
             }
             for ($i = 0; $i < $c; $i++) {
-                list($subkey, $val) = explode("=", $values[$i]);
+                list($subkey, $val) = explode('=', $values[$i]);
                 $out[trim($key)][trim($subkey)] = trim($val);
             }
         }
@@ -360,13 +360,13 @@ protected function processResponseHeaders()
                 return;
             }
             $name = $value = '';
-            $out = explode(": ", trim($line), 2);
+            $out = explode(': ', trim($line), 2);
             if (count($out) == 2) {
                 $name = $out[0];
                 $value = $out[1];
             }
             if (!empty($value)) {
-                if ($name == "Set-Cookie") {
+                if ($name == 'Set-Cookie') {
                     if (!isset($this->_responseHeaders[$name])) {
                         $this->_responseHeaders[$name] = [];
                     }
@@ -400,9 +400,9 @@ protected function processResponse()
         $response = '';
         $responseLine = trim(fgets($this->_sock, 1024));
 
-        $line = explode(" ", $responseLine, 3);
+        $line = explode(' ', $responseLine, 3);
         if (count($line) != 3) {
-            return $this->doError("Invalid response line returned from server: " . $responseLine);
+            return $this->doError('Invalid response line returned from server: ' . $responseLine);
         }
         $this->_responseStatus = (int) $line[1];
         $this->processResponseHeaders();
@@ -442,11 +442,11 @@ protected function makeRequest($method, $uri, $params = [])
         $errno = $errstr = '';
         $this->_sock = @fsockopen($this->_host, $this->_port, $errno, $errstr, $this->_timeout);
         if (!$this->_sock) {
-            return $this->doError(sprintf("[errno: %d] %s", $errno, $errstr));
+            return $this->doError(sprintf('[errno: %d] %s', $errno, $errstr));
         }
 
         $crlf = "\r\n";
-        $isPost = $method == "POST";
+        $isPost = $method == 'POST';
 
         $appendHeaders = [];
         $paramsStr = false;
@@ -487,8 +487,8 @@ public function doError($string)
     protected function headersToString($append = [])
     {
         $headers = [];
-        $headers["Host"] = $this->_host;
-        $headers['Connection'] = "close";
+        $headers['Host'] = $this->_host;
+        $headers['Connection'] = 'close';
         $headers = array_merge($headers, $this->_headers, $append);
         $str = [];
         foreach ($headers as $k => $v) {
diff --git a/lib/Mage/System/Ftp.php b/lib/Mage/System/Ftp.php
index ff2b1aebbe11..99a2c61bbfd0 100644
--- a/lib/Mage/System/Ftp.php
+++ b/lib/Mage/System/Ftp.php
@@ -37,7 +37,7 @@ class Mage_System_Ftp
     protected function checkConnected()
     {
         if (!$this->_conn) {
-            throw new Exception(__CLASS__ . " - no connection established with server");
+            throw new Exception(__CLASS__ . ' - no connection established with server');
         }
     }
 
@@ -67,13 +67,13 @@ public function mdkir($name)
     public function mkdirRecursive($path, $mode = 0777)
     {
         $this->checkConnected();
-        $dir = explode("/", $path);
-        $path = "";
+        $dir = explode('/', $path);
+        $path = '';
         $ret = true;
         for ($i = 0; $i < count($dir); $i++) {
-            $path .= "/" . $dir[$i];
+            $path .= '/' . $dir[$i];
             if (!@ftp_chdir($this->_conn, $path)) {
-                @ftp_chdir($this->_conn, "/");
+                @ftp_chdir($this->_conn, '/');
                 if (!@ftp_mkdir($this->_conn, $path)) {
                     $ret = false;
                     break;
@@ -95,12 +95,12 @@ public function mkdirRecursive($path, $mode = 0777)
      *
      * @SuppressWarnings(PHPMD.ErrorControlOperator)
      */
-    public function login($login = "anonymous", $password = "test@gmail.com")
+    public function login($login = 'anonymous', $password = 'test@gmail.com')
     {
         $this->checkConnected();
         $res = @ftp_login($this->_conn, $login, $password);
         if (!$res) {
-            throw new Exception("Invalid login credentials");
+            throw new Exception('Invalid login credentials');
         }
         return $res;
     }
@@ -195,8 +195,8 @@ public function put($remoteFile, $localFile, $mode = FTP_BINARY, $startPos = 0)
      */
     public function getcwd()
     {
-        $d = $this->raw("pwd");
-        $data = explode(" ", $d[0], 3);
+        $d = $this->raw('pwd');
+        $data = explode(' ', $d[0], 3);
         if (empty($data[1])) {
             return false;
         }
@@ -204,8 +204,8 @@ public function getcwd()
             return false;
         }
         $out = trim($data[1], '"');
-        if ($out !== "/") {
-            $out = rtrim($out, "/");
+        if ($out !== '/') {
+            $out = rtrim($out, '/');
         }
         return $out;
     }
@@ -250,16 +250,16 @@ public function upload($remote, $local, $dirMode = 0777, $ftpMode = FTP_BINARY)
             throw new Exception("Directory given instead of file: {$local}");
         }
 
-        $globalPathMode = substr($remote, 0, 1) == "/";
+        $globalPathMode = substr($remote, 0, 1) == '/';
         $dirname = dirname($remote);
         $cwd = $this->getcwd();
         if (false === $cwd) {
-            throw new Exception("Server returns something awful on PWD command");
+            throw new Exception('Server returns something awful on PWD command');
         }
 
         if (!$globalPathMode) {
-            $dirname = $cwd . "/" . $dirname;
-            $remote = $cwd . "/" . $remote;
+            $dirname = $cwd . '/' . $dirname;
+            $remote = $cwd . '/' . $remote;
         }
         $res = $this->mkdirRecursive($dirname, $dirMode);
         $this->chdir($cwd);
@@ -380,7 +380,7 @@ public function get($localFile, $remoteFile, $fileMode = FTP_BINARY, $resumeOffs
      *
      * @SuppressWarnings(PHPMD.ErrorControlOperator)
      */
-    public function nlist($dir = "/")
+    public function nlist($dir = '/')
     {
         $this->checkConnected();
         $dir = $this->correctFilePath($dir);
@@ -396,7 +396,7 @@ public function nlist($dir = "/")
      *
      * @SuppressWarnings(PHPMD.ErrorControlOperator)
      */
-    public function rawlist($dir = "/", $recursive = false)
+    public function rawlist($dir = '/', $recursive = false)
     {
         $this->checkConnected();
         $dir = $this->correctFilePath($dir);
@@ -440,10 +440,10 @@ public static function chmodnum($chmod)
     public function fileExists($path, $excludeIfIsDir = true)
     {
         $path = $this->correctFilePath($path);
-        $globalPathMode = substr($path, 0, 1) == "/";
+        $globalPathMode = substr($path, 0, 1) == '/';
 
         $file = basename($path);
-        $dir = $globalPathMode ? dirname($path) : $this->getcwd() . "/" . $path;
+        $dir = $globalPathMode ? dirname($path) : $this->getcwd() . '/' . $path;
         $data = $this->ls($dir);
         foreach ($data as $row) {
             if ($file == $row['name']) {
@@ -463,7 +463,7 @@ public function fileExists($path, $excludeIfIsDir = true)
      * @param bool $recursive
      * @return array
      */
-    public function ls($dir = "/", $recursive = false)
+    public function ls($dir = '/', $recursive = false)
     {
         $dir = $this->correctFilePath($dir);
         $rawfiles = (array) $this->rawlist($dir, $recursive);
@@ -504,8 +504,8 @@ public function ls($dir = "/", $recursive = false)
      */
     public function correctFilePath($str)
     {
-        $str = str_replace("\\", "/", $str);
-        $str = preg_replace("/^.\//", "", $str);
+        $str = str_replace('\\', '/', $str);
+        $str = preg_replace("/^.\//", '', $str);
         return $str;
     }
 
diff --git a/lib/Magento/Db/Sql/Trigger.php b/lib/Magento/Db/Sql/Trigger.php
index c2426b15d1fb..5ca9af0fbdfa 100644
--- a/lib/Magento/Db/Sql/Trigger.php
+++ b/lib/Magento/Db/Sql/Trigger.php
@@ -288,10 +288,10 @@ public function getBody()
     public function assemble()
     {
         $this->_validateIsComplete();
-        return "CREATE TRIGGER "
+        return 'CREATE TRIGGER '
             . $this->getName() . "\n"
-            . $this->_parts[self::TIME] . " " . $this->_parts[self::EVENT] . "\n"
-            . "ON " . $this->_parts[self::TARGET] . " " . $this->_parts[self::SCOPE] . "\n"
+            . $this->_parts[self::TIME] . ' ' . $this->_parts[self::EVENT] . "\n"
+            . 'ON ' . $this->_parts[self::TARGET] . ' ' . $this->_parts[self::SCOPE] . "\n"
             . "BEGIN\n"
             . implode("\n", $this->_parts[self::BODY]) . "\n"
             . "END;\n";
diff --git a/lib/Varien/Cache/Backend/Memcached.php b/lib/Varien/Cache/Backend/Memcached.php
index a1dbc9a403b0..b67c7c4c0f8b 100644
--- a/lib/Varien/Cache/Backend/Memcached.php
+++ b/lib/Varien/Cache/Backend/Memcached.php
@@ -42,7 +42,7 @@ public function __construct(array $options = [])
 
         if (!isset($options['slab_size']) || !is_numeric($options['slab_size'])) {
             if (isset($options['slab_size'])) {
-                throw new Varien_Exception("Invalid value for the node <slab_size>. Expected to be positive integer.");
+                throw new Varien_Exception('Invalid value for the node <slab_size>. Expected to be positive integer.');
             }
 
             $this->_options['slab_size'] = self::DEFAULT_SLAB_SIZE;
diff --git a/lib/Varien/Cache/Core.php b/lib/Varien/Cache/Core.php
index ac1f61166e8d..f61973ad7c8d 100644
--- a/lib/Varien/Cache/Core.php
+++ b/lib/Varien/Cache/Core.php
@@ -37,7 +37,7 @@ public function __construct($options = [])
     {
         parent::__construct($options);
         if (!is_numeric($this->getOption('slab_size'))) {
-            throw new Varien_Exception("Invalid value for the node <slab_size>. Expected to be integer.");
+            throw new Varien_Exception('Invalid value for the node <slab_size>. Expected to be integer.');
         }
     }
 
diff --git a/lib/Varien/Convert/Container/Abstract.php b/lib/Varien/Convert/Container/Abstract.php
index 242472caee67..38dbea0e9894 100644
--- a/lib/Varien/Convert/Container/Abstract.php
+++ b/lib/Varien/Convert/Container/Abstract.php
@@ -83,7 +83,7 @@ public function validateDataString($data = null)
             $data = $this->getData();
         }
         if (!is_string($data)) {
-            $this->addException("Invalid data type, expecting string.", Varien_Convert_Exception::FATAL);
+            $this->addException('Invalid data type, expecting string.', Varien_Convert_Exception::FATAL);
         }
         return true;
     }
@@ -94,7 +94,7 @@ public function validateDataArray($data = null)
             $data = $this->getData();
         }
         if (!is_array($data)) {
-            $this->addException("Invalid data type, expecting array.", Varien_Convert_Exception::FATAL);
+            $this->addException('Invalid data type, expecting array.', Varien_Convert_Exception::FATAL);
         }
         return true;
     }
@@ -108,7 +108,7 @@ public function validateDataGrid($data = null)
             if (count($data) == 0) {
                 return true;
             }
-            $this->addException("Invalid data type, expecting 2D grid array.", Varien_Convert_Exception::FATAL);
+            $this->addException('Invalid data type, expecting 2D grid array.', Varien_Convert_Exception::FATAL);
         }
         return true;
     }
diff --git a/lib/Varien/Convert/Parser/Xml/Excel.php b/lib/Varien/Convert/Parser/Xml/Excel.php
index 4b8ecd8036d4..0f1399c2ccdc 100644
--- a/lib/Varien/Convert/Parser/Xml/Excel.php
+++ b/lib/Varien/Convert/Parser/Xml/Excel.php
@@ -199,9 +199,9 @@ public function getRowXml(array $row)
             $this->_xmlElement->row = htmlspecialchars($value);
             $value = str_replace($xmlHeader, '', $this->_xmlElement->asXML());
             $value = preg_replace($xmlRegexp, '\\1', $value);
-            $dataType = "String";
+            $dataType = 'String';
             if (is_numeric($value)) {
-                $dataType = "Number";
+                $dataType = 'Number';
                 // is_numeric(' 96000') returns true, but Excel argues about space
                 $value = trim($value);
             }
diff --git a/lib/Varien/Convert/Profile/Abstract.php b/lib/Varien/Convert/Profile/Abstract.php
index dfd2d76a8561..c7554d6e80ee 100644
--- a/lib/Varien/Convert/Profile/Abstract.php
+++ b/lib/Varien/Convert/Profile/Abstract.php
@@ -93,7 +93,7 @@ public function addException(Varien_Convert_Exception $e)
     public function run()
     {
         if (!$this->_actions) {
-            $e = new Varien_Convert_Exception("Could not find any actions for this profile");
+            $e = new Varien_Convert_Exception('Could not find any actions for this profile');
             $e->setLevel(Varien_Convert_Exception::FATAL);
             $this->addException($e);
             return;
diff --git a/lib/Varien/Data/Collection/Db.php b/lib/Varien/Data/Collection/Db.php
index a35fc1ecd7f7..a78999460fc7 100644
--- a/lib/Varien/Data/Collection/Db.php
+++ b/lib/Varien/Data/Collection/Db.php
@@ -236,7 +236,7 @@ public function getSelectCountSql()
             $group = array_map(function ($token) {
                 return $this->getSelect()->getAdapter()->quoteIdentifier($token, true);
             }, $group);
-            $countSelect->columns("COUNT(DISTINCT " . implode(", ", $group) . ")");
+            $countSelect->columns('COUNT(DISTINCT ' . implode(', ', $group) . ')');
         } else {
             $countSelect->columns('COUNT(*)');
 
diff --git a/lib/Varien/Data/Form/Element/Editor.php b/lib/Varien/Data/Form/Element/Editor.php
index 43d40074109f..3656de319fc1 100644
--- a/lib/Varien/Data/Form/Element/Editor.php
+++ b/lib/Varien/Data/Form/Element/Editor.php
@@ -194,7 +194,7 @@ protected function _getPluginButtonsHtml($visible = true)
         if ($this->getConfig('add_widgets')) {
             $buttonsHtml .= $this->_getButtonHtml([
                 'title'     => $this->translate('Insert Widget...'),
-                'onclick'   => "widgetTools.openDialog('" . $this->getConfig('widget_window_url') . "widget_target_id/"
+                'onclick'   => "widgetTools.openDialog('" . $this->getConfig('widget_window_url') . 'widget_target_id/'
                                . $this->getHtmlId() . "')",
                 'class'     => 'add-widget plugin',
                 'style'     => $visible ? '' : 'display:none',
@@ -207,7 +207,7 @@ protected function _getPluginButtonsHtml($visible = true)
                 'title'     => $this->translate('Insert Image...'),
                 'onclick'   => "MediabrowserUtility.openDialog('" .
                                    $this->getConfig('files_browser_window_url') .
-                                   "target_element_id/" . $this->getHtmlId() . "/" .
+                                   'target_element_id/' . $this->getHtmlId() . '/' .
                                    ((null !== $this->getConfig('store_id'))
                                        ? ('store/' . $this->getConfig('store_id') . '/')
                                        : '') .
diff --git a/lib/Varien/Data/Form/Element/Textarea.php b/lib/Varien/Data/Form/Element/Textarea.php
index 23108c984d30..98f4ec32e489 100644
--- a/lib/Varien/Data/Form/Element/Textarea.php
+++ b/lib/Varien/Data/Form/Element/Textarea.php
@@ -53,7 +53,7 @@ public function getElementHtml()
         $this->addClass('textarea');
         $html = '<textarea id="' . $this->getHtmlId() . '" name="' . $this->getName() . '" ' . $this->serialize($this->getHtmlAttributes()) . ' >';
         $html .= $this->getEscapedValue();
-        $html .= "</textarea>";
+        $html .= '</textarea>';
         $html .= $this->getAfterElementHtml();
         return $html;
     }
diff --git a/lib/Varien/Db/Adapter/Pdo/Mysql.php b/lib/Varien/Db/Adapter/Pdo/Mysql.php
index 93412dad7c69..6cde14f59cf0 100644
--- a/lib/Varien/Db/Adapter/Pdo/Mysql.php
+++ b/lib/Varien/Db/Adapter/Pdo/Mysql.php
@@ -580,13 +580,13 @@ public function proccessBindCallback($matches)
     protected function _unQuote($string)
     {
         $translate = [
-            "\\000" => "\000",
-            "\\n"   => "\n",
-            "\\r"   => "\r",
-            "\\\\"  => "\\",
+            '\\000' => "\000",
+            '\\n'   => "\n",
+            '\\r'   => "\r",
+            '\\\\'  => '\\',
             "\'"    => "'",
-            "\\\""  => "\"",
-            "\\032" => "\032"
+            '\\"'  => '"',
+            '\\032' => "\032"
         ];
         return strtr($string, $translate);
     }
@@ -828,7 +828,7 @@ public function purgeOrphanRecords(
             || $onDelete == Varien_Db_Adapter_Interface::FK_ACTION_RESTRICT
         ) {
             $sql = sprintf(
-                "DELETE p.* FROM %s AS p LEFT JOIN %s AS r ON p.%s = r.%s WHERE r.%s IS NULL",
+                'DELETE p.* FROM %s AS p LEFT JOIN %s AS r ON p.%s = r.%s WHERE r.%s IS NULL',
                 $this->quoteIdentifier($tableName),
                 $this->quoteIdentifier($refTableName),
                 $this->quoteIdentifier($columnName),
@@ -838,7 +838,7 @@ public function purgeOrphanRecords(
             $this->raw_query($sql);
         } elseif ($onDelete == Varien_Db_Adapter_Interface::FK_ACTION_SET_NULL) {
             $sql = sprintf(
-                "UPDATE %s AS p LEFT JOIN %s AS r ON p.%s = r.%s SET p.%s = NULL WHERE r.%s IS NULL",
+                'UPDATE %s AS p LEFT JOIN %s AS r ON p.%s = r.%s SET p.%s = NULL WHERE r.%s IS NULL',
                 $this->quoteIdentifier($tableName),
                 $this->quoteIdentifier($refTableName),
                 $this->quoteIdentifier($columnName),
@@ -931,7 +931,7 @@ public function addColumn($tableName, $columnName, $definition, $schemaName = nu
         if (is_array($definition)) {
             $definition = array_change_key_case($definition, CASE_UPPER);
             if (empty($definition['COMMENT'])) {
-                throw new Zend_Db_Exception("Impossible to create a column without comment.");
+                throw new Zend_Db_Exception('Impossible to create a column without comment.');
             }
             if (!empty($definition['PRIMARY'])) {
                 $primaryKey = sprintf(', ADD PRIMARY KEY (%s)', $this->quoteIdentifier($columnName));
@@ -2194,7 +2194,7 @@ public function insertIgnore($table, array $bind)
         }
 
         // build the statement
-        $sql = "INSERT IGNORE INTO "
+        $sql = 'INSERT IGNORE INTO '
             . $this->quoteIdentifier($table, true)
             . ' (' . implode(', ', $cols) . ') '
             . 'VALUES (' . implode(', ', $vals) . ')';
@@ -2252,7 +2252,7 @@ public function createTable(Varien_Db_Ddl_Table $table)
         $columns = $table->getColumns();
         foreach ($columns as $columnEntry) {
             if (empty($columnEntry['COMMENT'])) {
-                throw new Zend_Db_Exception("Cannot create table without columns comments");
+                throw new Zend_Db_Exception('Cannot create table without columns comments');
             }
         }
 
@@ -2266,7 +2266,7 @@ public function createTable(Varien_Db_Ddl_Table $table)
             "CREATE TABLE %s (\n%s\n) %s",
             $this->quoteIdentifier($table->getName()),
             implode(",\n", $sqlFragment),
-            implode(" ", $tableOptions)
+            implode(' ', $tableOptions)
         );
 
         return $this->query($sql);
@@ -2291,7 +2291,7 @@ public function createTemporaryTable(Varien_Db_Ddl_Table $table)
             "CREATE TEMPORARY TABLE %s (\n%s\n) %s",
             $this->quoteIdentifier($table->getName()),
             implode(",\n", $sqlFragment),
-            implode(" ", $tableOptions)
+            implode(' ', $tableOptions)
         );
 
         return $this->query($sql);
@@ -2951,7 +2951,7 @@ public function formatDate($date, $includeTime = true)
     public function startSetup()
     {
         $this->raw_query("SET SQL_MODE=''");
-        $this->raw_query("SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0");
+        $this->raw_query('SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0');
         $this->raw_query("SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO'");
 
         return $this;
@@ -2965,7 +2965,7 @@ public function startSetup()
     public function endSetup()
     {
         $this->raw_query("SET SQL_MODE=IFNULL(@OLD_SQL_MODE,'')");
-        $this->raw_query("SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS=0, 0, 1)");
+        $this->raw_query('SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS=0, 0, 1)');
 
         return $this;
     }
@@ -3003,23 +3003,23 @@ public function endSetup()
     public function prepareSqlCondition($fieldName, $condition)
     {
         $conditionKeyMap = [
-            'eq'            => "{{fieldName}} = ?",
-            'neq'           => "{{fieldName}} != ?",
-            'like'          => "{{fieldName}} LIKE ?",
-            'nlike'         => "{{fieldName}} NOT LIKE ?",
-            'in'            => "{{fieldName}} IN(?)",
-            'nin'           => "{{fieldName}} NOT IN(?)",
-            'is'            => "{{fieldName}} IS ?",
-            'notnull'       => "{{fieldName}} IS NOT NULL",
-            'null'          => "{{fieldName}} IS NULL",
-            'gt'            => "{{fieldName}} > ?",
-            'lt'            => "{{fieldName}} < ?",
-            'gteq'          => "{{fieldName}} >= ?",
-            'lteq'          => "{{fieldName}} <= ?",
-            'finset'        => "FIND_IN_SET(?, {{fieldName}})",
-            'regexp'        => "{{fieldName}} REGEXP ?",
-            'from'          => "{{fieldName}} >= ?",
-            'to'            => "{{fieldName}} <= ?",
+            'eq'            => '{{fieldName}} = ?',
+            'neq'           => '{{fieldName}} != ?',
+            'like'          => '{{fieldName}} LIKE ?',
+            'nlike'         => '{{fieldName}} NOT LIKE ?',
+            'in'            => '{{fieldName}} IN(?)',
+            'nin'           => '{{fieldName}} NOT IN(?)',
+            'is'            => '{{fieldName}} IS ?',
+            'notnull'       => '{{fieldName}} IS NOT NULL',
+            'null'          => '{{fieldName}} IS NULL',
+            'gt'            => '{{fieldName}} > ?',
+            'lt'            => '{{fieldName}} < ?',
+            'gteq'          => '{{fieldName}} >= ?',
+            'lteq'          => '{{fieldName}} <= ?',
+            'finset'        => 'FIND_IN_SET(?, {{fieldName}})',
+            'regexp'        => '{{fieldName}} REGEXP ?',
+            'from'          => '{{fieldName}} >= ?',
+            'to'            => '{{fieldName}} <= ?',
             'seq'           => null,
             'sneq'          => null
         ];
@@ -3189,9 +3189,9 @@ public function prepareColumnValue(array $column, $value)
     public function getCheckSql($expression, $true, $false)
     {
         if ($expression instanceof Zend_Db_Expr || $expression instanceof Zend_Db_Select) {
-            $expression = sprintf("IF((%s), %s, %s)", $expression, $true, $false);
+            $expression = sprintf('IF((%s), %s, %s)', $expression, $true, $false);
         } else {
-            $expression = sprintf("IF(%s, %s, %s)", $expression, $true, $false);
+            $expression = sprintf('IF(%s, %s, %s)', $expression, $true, $false);
         }
 
         return new Zend_Db_Expr($expression);
@@ -3207,9 +3207,9 @@ public function getCheckSql($expression, $true, $false)
     public function getIfNullSql($expression, $value = '0')
     {
         if ($expression instanceof Zend_Db_Expr || $expression instanceof Zend_Db_Select) {
-            $expression = sprintf("IFNULL((%s), %s)", $expression, $value);
+            $expression = sprintf('IFNULL((%s), %s)', $expression, $value);
         } else {
-            $expression = sprintf("IFNULL(%s, %s)", $expression, $value);
+            $expression = sprintf('IFNULL(%s, %s)', $expression, $value);
         }
 
         return new Zend_Db_Expr($expression);
diff --git a/lib/Varien/Debug.php b/lib/Varien/Debug.php
index 7a772a5c1207..367b29e63fcc 100644
--- a/lib/Varien/Debug.php
+++ b/lib/Varien/Debug.php
@@ -153,7 +153,7 @@ protected static function _formatCalledArgument($arg)
     {
         $out = '';
         if (is_object($arg)) {
-            $out .= sprintf("&%s#%s#", get_class($arg), spl_object_hash($arg));
+            $out .= sprintf('&%s#%s#', get_class($arg), spl_object_hash($arg));
         } elseif (is_resource($arg)) {
             $out .= '#[' . get_resource_type($arg) . ']';
         } elseif (is_array($arg)) {
@@ -180,7 +180,7 @@ protected static function _formatCalledArgument($arg)
             $out .= $arg;
         } elseif (is_string($arg)) {
             if (strlen($arg) > self::$argLength) {
-                $arg = substr($arg, 0, self::$argLength) . "...";
+                $arg = substr($arg, 0, self::$argLength) . '...';
             }
             $arg = strtr($arg, ["\t" => '\t', "\r" => '\r', "\n" => '\n', "'" => '\\\'']);
             $out .= "'" . $arg . "'";
diff --git a/lib/Varien/Directory/Collection.php b/lib/Varien/Directory/Collection.php
index a531cf07b4e5..f24d0c115b66 100644
--- a/lib/Varien/Directory/Collection.php
+++ b/lib/Varien/Directory/Collection.php
@@ -145,7 +145,7 @@ public function lastDir()
      */
     public static function getLastDir($path)
     {
-        $last = strrpos($path, "/");
+        $last = strrpos($path, '/');
         return substr($path, $last + 1);
     }
     /**
diff --git a/lib/Varien/Directory/Factory.php b/lib/Varien/Directory/Factory.php
index 83025ee94ac3..8231eb6c622d 100644
--- a/lib/Varien/Directory/Factory.php
+++ b/lib/Varien/Directory/Factory.php
@@ -20,8 +20,8 @@
  * @package    Varien_Directory
  */
 
-require_once("Varien/Directory/Collection.php");
-require_once("Varien/File/Object.php");
+require_once('Varien/Directory/Collection.php');
+require_once('Varien/File/Object.php');
 
 class Varien_Directory_Factory
 {
diff --git a/lib/Varien/File/Object.php b/lib/Varien/File/Object.php
index 48e10b8db2f8..55dab25cbaed 100644
--- a/lib/Varien/File/Object.php
+++ b/lib/Varien/File/Object.php
@@ -20,7 +20,7 @@
  * @package    Varien_File
  */
 
-require_once("Varien/Object.php");
+require_once('Varien/Object.php');
 require_once('Varien/Directory/IFactory.php');
 
 class Varien_File_Object extends SplFileObject implements IFactory
@@ -180,8 +180,8 @@ public function getExtension()
     public static function getExt($fileName)
     {
         $path_parts = pathinfo($fileName);
-        if (isset($path_parts["extension"])) {
-            return $path_parts["extension"];
+        if (isset($path_parts['extension'])) {
+            return $path_parts['extension'];
         } else {
             return '';
         }
diff --git a/lib/Varien/File/Transfer/Adapter/Http.php b/lib/Varien/File/Transfer/Adapter/Http.php
index 63e6c3755f75..bac95988909b 100644
--- a/lib/Varien/File/Transfer/Adapter/Http.php
+++ b/lib/Varien/File/Transfer/Adapter/Http.php
@@ -78,7 +78,7 @@ public function send($options = null)
         } elseif (is_array($options)) {
             $filepath = $options['filepath'];
         } else {
-            throw new Exception("Filename is not set.");
+            throw new Exception('Filename is not set.');
         }
 
         if (!is_file($filepath) || !is_readable($filepath)) {
diff --git a/lib/Varien/File/Uploader/Image.php b/lib/Varien/File/Uploader/Image.php
index c2a6f0ae91c3..6402884e482f 100644
--- a/lib/Varien/File/Uploader/Image.php
+++ b/lib/Varien/File/Uploader/Image.php
@@ -74,7 +74,7 @@ public function rotate($degrees = null)
      * @access public
      * @param string $type
      */
-    public function flip($type = "h")
+    public function flip($type = 'h')
     {
         $this->uploader->image_flip = $type;
     }
@@ -115,7 +115,7 @@ public function crop($crop = 0)
      * Default value is 'jpeg'
      *
      */
-    public function convert($format = "jpeg")
+    public function convert($format = 'jpeg')
     {
         $this->uploader->image_convert = $format;
     }
@@ -147,7 +147,7 @@ public function convert($format = "jpeg")
      * If a negative value is used, it will represent the distance between the right of the image and the watermark
      *
      */
-    public function addWatermark($fileName = null, $position = "BL", $absoluteX = null, $absoluteY = null)
+    public function addWatermark($fileName = null, $position = 'BL', $absoluteX = null, $absoluteY = null)
     {
         if (!isset($fileName)) {
             return;
@@ -178,7 +178,7 @@ public function addWatermark($fileName = null, $position = "BL", $absoluteX = nu
      * Value is an integer between 0 (no opacity) and 100 (full opacity).
      *
      */
-    public function addReflection($height = "10%", $space = 0, $color = "#FFFFFF", $opacity = 60)
+    public function addReflection($height = '10%', $space = 0, $color = '#FFFFFF', $opacity = 60)
     {
         if ((int) $height == 0) {
             return;
@@ -195,9 +195,9 @@ public function addReflection($height = "10%", $space = 0, $color = "#FFFFFF", $
      *
      * Value is a string, any text. Text will not word-wrap, although you can use breaklines in your text "\n"
      */
-    public function addText($string = "")
+    public function addText($string = '')
     {
-        if (trim($string) == "") {
+        if (trim($string) == '') {
             return;
         }
 
@@ -234,7 +234,7 @@ public function setTextFont($font)
         $this->uploader->image_text_font = $font;
     }
 
-    public function setTextPosition($position = "TR")
+    public function setTextPosition($position = 'TR')
     {
         $this->uploader->image_text_position = $position;
     }
@@ -299,7 +299,7 @@ public function colorInvert()
      * $percent value is a percentage, as an integer between 0 and 100
      *
      */
-    public function colorOverlay($color = "#FFFFFF", $percent = 50)
+    public function colorOverlay($color = '#FFFFFF', $percent = 50)
     {
         $this->uploader->image_overlay_color = $color;
         $this->uploader->image_overlay_percent = $percent;
@@ -345,7 +345,7 @@ public function setJpegQuality($value = 85)
      * Is generally used when cropping an image with negative margins
      *
      */
-    public function setBgColor($color = "#000000")
+    public function setBgColor($color = '#000000')
     {
         $this->uploader->image_background_color = $color;
     }
diff --git a/lib/Varien/Filter/Template.php b/lib/Varien/Filter/Template.php
index 45df4772644c..a58c90c0ad43 100644
--- a/lib/Varien/Filter/Template.php
+++ b/lib/Varien/Filter/Template.php
@@ -272,7 +272,7 @@ protected function _getIncludeParameters($value)
     */
     protected function _getVariable($value, $default = '{no_value_defined}')
     {
-        Varien_Profiler::start("email_template_proccessing_variables");
+        Varien_Profiler::start('email_template_proccessing_variables');
         $tokenizer = new Varien_Filter_Template_Tokenizer_Variable();
         $tokenizer->setString($value);
         $stackVars = $tokenizer->tokenize();
@@ -314,7 +314,7 @@ protected function _getVariable($value, $default = '{no_value_defined}')
             // If value for construction exists set it
             $result = $stackVars[$last]['variable'];
         }
-        Varien_Profiler::stop("email_template_proccessing_variables");
+        Varien_Profiler::stop('email_template_proccessing_variables');
         return $result;
     }
 
diff --git a/lib/Varien/Image/Adapter/Gd2.php b/lib/Varien/Image/Adapter/Gd2.php
index 8f99a6c9cab5..791c16e9c273 100644
--- a/lib/Varien/Image/Adapter/Gd2.php
+++ b/lib/Varien/Image/Adapter/Gd2.php
@@ -15,7 +15,7 @@
 
 class Varien_Image_Adapter_Gd2 extends Varien_Image_Adapter_Abstract
 {
-    protected $_requiredExtensions = ["gd"];
+    protected $_requiredExtensions = ['gd'];
     private static $_callbacks = [
         IMAGETYPE_WEBP => ['output' => 'imagewebp', 'create' => 'imagecreatefromwebp'],
         IMAGETYPE_GIF  => ['output' => 'imagegif',  'create' => 'imagecreatefromgif'],
@@ -129,13 +129,13 @@ public function save($destination = null, $newName = null)
         $fileName = (!isset($destination)) ? $this->_fileName : $destination;
 
         if (isset($destination) && isset($newName)) {
-            $fileName = $destination . "/" . $newName;
+            $fileName = $destination . '/' . $newName;
         } elseif (isset($destination) && !isset($newName)) {
             $info = pathinfo($destination);
             $fileName = $destination;
             $destination = $info['dirname'];
         } elseif (!isset($destination) && isset($newName)) {
-            $fileName = $this->_fileSrcPath . "/" . $newName;
+            $fileName = $this->_fileSrcPath . '/' . $newName;
         } else {
             $fileName = $this->_fileSrcPath . $this->_fileSrcName;
         }
@@ -209,7 +209,7 @@ public function save($destination = null, $newName = null)
 
     public function display()
     {
-        header("Content-type: " . $this->getMimeTypeWithOutFileType());
+        header('Content-type: ' . $this->getMimeTypeWithOutFileType());
         call_user_func($this->_getCallback('output'), $this->_imageHandler);
     }
 
diff --git a/lib/Varien/Io/Abstract.php b/lib/Varien/Io/Abstract.php
index 09dd9663db95..f7ee94104339 100644
--- a/lib/Varien/Io/Abstract.php
+++ b/lib/Varien/Io/Abstract.php
@@ -63,9 +63,9 @@ public function getCleanPath($path)
             return './';
         }
 
-        $path = trim(preg_replace("/\\\\/", "/", (string)$path));
+        $path = trim(preg_replace('/\\\\/', '/', (string)$path));
 
-        if (!preg_match("/(\.\w{1,4})$/", $path) && !preg_match("/\?[^\\/]+$/", $path) && !preg_match("/\\/$/", $path)) {
+        if (!preg_match("/(\.\w{1,4})$/", $path) && !preg_match("/\?[^\\/]+$/", $path) && !preg_match('/\\/$/', $path)) {
             $path .= '/';
         }
 
@@ -76,16 +76,16 @@ public function getCleanPath($path)
         $pathTokR = $matches[0][1];
         $pathTokP = $matches[0][2];
 
-        $pathTokP = preg_replace(["/^\\/+/", "/\\/+/"], ["", "/"], $pathTokP);
+        $pathTokP = preg_replace(['/^\\/+/', '/\\/+/'], ['', '/'], $pathTokP);
 
-        $pathParts = explode("/", $pathTokP);
+        $pathParts = explode('/', $pathTokP);
         $realPathParts = [];
 
         for ($i = 0, $realPathParts = []; $i < count($pathParts); $i++) {
             if ($pathParts[$i] == '.') {
                 continue;
             } elseif ($pathParts[$i] == '..') {
-                if ((isset($realPathParts[0])  &&  $realPathParts[0] != '..') || ($pathTokR != "")) {
+                if ((isset($realPathParts[0])  &&  $realPathParts[0] != '..') || ($pathTokR != '')) {
                     array_pop($realPathParts);
                     continue;
                 }
diff --git a/lib/Varien/Io/File.php b/lib/Varien/Io/File.php
index 30a71a6444ea..ca8658391fb3 100644
--- a/lib/Varien/Io/File.php
+++ b/lib/Varien/Io/File.php
@@ -409,7 +409,7 @@ public static function rmdirRecursive($dir, $recursive = true)
                     if (!strcmp($item, '.') || !strcmp($item, '..')) {
                         continue;
                     }
-                    self::rmdirRecursive($dir . "/" . $item, $recursive);
+                    self::rmdirRecursive($dir . '/' . $item, $recursive);
                 }
                 $result = @rmdir($dir);
             } elseif (file_exists($dir)) {
@@ -898,13 +898,13 @@ protected function _parsePermissions($mode)
 
         /* Adjust for SUID, SGID and sticky bit */
         if ($mode & 0x800) {
-            $owner["execute"] = ($owner['execute'] == 'x') ? 's' : 'S';
+            $owner['execute'] = ($owner['execute'] == 'x') ? 's' : 'S';
         }
         if ($mode & 0x400) {
-            $group["execute"] = ($group['execute'] == 'x') ? 's' : 'S';
+            $group['execute'] = ($group['execute'] == 'x') ? 's' : 'S';
         }
         if ($mode & 0x200) {
-            $world["execute"] = ($world['execute'] == 'x') ? 't' : 'T';
+            $world['execute'] = ($world['execute'] == 'x') ? 't' : 'T';
         }
 
         $s = sprintf('%1s', $type);
diff --git a/lib/Varien/Io/Sftp.php b/lib/Varien/Io/Sftp.php
index 6c71da2c54b7..024140880b1d 100644
--- a/lib/Varien/Io/Sftp.php
+++ b/lib/Varien/Io/Sftp.php
@@ -53,7 +53,7 @@ public function open(array $args = [])
         }
         $this->_connection = new \phpseclib3\Net\SFTP($host, $port, $args['timeout']);
         if (!$this->_connection->login($args['username'], $args['password'])) {
-            throw new Exception(sprintf(__("Unable to open SFTP connection as %s@%s", $args['username'], $args['host'])));
+            throw new Exception(sprintf(__('Unable to open SFTP connection as %s@%s', $args['username'], $args['host'])));
         }
     }
 
diff --git a/lib/Varien/Object.php b/lib/Varien/Object.php
index bfd0f11bcffb..f82f4ed60981 100644
--- a/lib/Varien/Object.php
+++ b/lib/Varien/Object.php
@@ -635,7 +635,7 @@ public function __call($method, $args)
                 //Varien_Profiler::stop('HAS: '.get_class($this).'::'.$method);
                 return isset($this->_data[$key]);
         }
-        throw new Varien_Exception("Invalid method " . get_class($this) . "::" . $method . "(" . print_r($args, 1) . ")");
+        throw new Varien_Exception('Invalid method ' . get_class($this) . '::' . $method . '(' . print_r($args, 1) . ')');
     }
 
     /**
@@ -690,7 +690,7 @@ protected function _underscore($name)
             return self::$_underscoreCache[$name];
         }
         #Varien_Profiler::start('underscore');
-        $result = strtolower(preg_replace('/([A-Z])/', "_$1", lcfirst($name)));
+        $result = strtolower(preg_replace('/([A-Z])/', '_$1', lcfirst($name)));
         #Varien_Profiler::stop('underscore');
         self::$_underscoreCache[$name] = $result;
         return $result;
diff --git a/lib/Varien/Profiler.php b/lib/Varien/Profiler.php
index 0153bbc9bcc1..e2308ff62012 100644
--- a/lib/Varien/Profiler.php
+++ b/lib/Varien/Profiler.php
@@ -162,11 +162,11 @@ public static function getSqlProfiler($res)
                 }
             }
 
-            $out .= 'Executed ' . $queryCount . ' queries in ' . $totalTime . ' seconds' . "<br>";
-            $out .= 'Average query length: ' . $totalTime / $queryCount . ' seconds' . "<br>";
-            $out .= 'Queries per second: ' . $queryCount / $totalTime . "<br>";
-            $out .= 'Longest query length: ' . $longestTime . "<br>";
-            $out .= 'Longest query: <br>' . $longestQuery . "<hr>";
+            $out .= 'Executed ' . $queryCount . ' queries in ' . $totalTime . ' seconds' . '<br>';
+            $out .= 'Average query length: ' . $totalTime / $queryCount . ' seconds' . '<br>';
+            $out .= 'Queries per second: ' . $queryCount / $totalTime . '<br>';
+            $out .= 'Longest query length: ' . $longestTime . '<br>';
+            $out .= 'Longest query: <br>' . $longestQuery . '<hr>';
         }
         return $out;
     }
diff --git a/lib/Varien/Simplexml/Config.php b/lib/Varien/Simplexml/Config.php
index 12f1a4248055..ef4f5aeebc8b 100644
--- a/lib/Varien/Simplexml/Config.php
+++ b/lib/Varien/Simplexml/Config.php
@@ -72,7 +72,7 @@ class Varien_Simplexml_Config
      *
      * @example <allResources extends="/config/modules//resource"/>
      */
-    protected $_xpathExtends = "//*[@extends]";
+    protected $_xpathExtends = '//*[@extends]';
 
     /**
      * Constructor
diff --git a/lib/Varien/Simplexml/Element.php b/lib/Varien/Simplexml/Element.php
index 6f19de595ee9..ee22aa78864b 100644
--- a/lib/Varien/Simplexml/Element.php
+++ b/lib/Varien/Simplexml/Element.php
@@ -141,10 +141,10 @@ public function descend($path)
             // Simple exploding by / does not suffice,
             // as an attribute value may contain a / inside
             // Note that there are three matches for different kinds of attribute values specification
-            if (strpos($path, "@") === false) {
+            if (strpos($path, '@') === false) {
                 $pathArr = explode('/', $path);
             } else {
-                $regex = "#([^@/\\\"]+(?:@[^=/]+=(?:\\\"[^\\\"]*\\\"|[^/]*))?)/?#";
+                $regex = '#([^@/\\"]+(?:@[^=/]+=(?:\\"[^\\"]*\\"|[^/]*))?)/?#';
                 $pathArr = $pathMatches = [];
                 if (preg_match_all($regex, $path, $pathMatches)) {
                     $pathArr = $pathMatches[1];
diff --git a/shell/indexer.php b/shell/indexer.php
index 47d0494e4ca0..929820ec06c3 100644
--- a/shell/indexer.php
+++ b/shell/indexer.php
@@ -160,7 +160,7 @@ public function run()
                         $resultTime = microtime(true) - $startTime;
                         Mage::dispatchEvent($process->getIndexerCode() . '_shell_reindex_after');
                         echo $process->getIndexer()->getName()
-                            . " index was rebuilt successfully in " . gmdate('H:i:s', ceil($resultTime)) . "\n";
+                            . ' index was rebuilt successfully in ' . gmdate('H:i:s', ceil($resultTime)) . "\n";
                     } catch (Mage_Core_Exception $e) {
                         echo $e->getMessage() . "\n";
                     } catch (Exception $e) {

From 35f331bc86ef2390cf73e23966f1fa0db862c879 Mon Sep 17 00:00:00 2001
From: Tony <tonyweboss@gmail.com>
Date: Mon, 2 Sep 2024 07:46:44 +0200
Subject: [PATCH 3/6] Fixed issues #4134 undefined array index
 label_use_default in Mage_Catalog_Model_Product_Attribute_Backend_Media
 (#4136)

* fix issues 4134

* better code
Co-authored-by: kiatng

---------

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>
---
 .../Mage/Catalog/Model/Product/Attribute/Backend/Media.php  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php b/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
index 142faed31281..9bbd405d247e 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php
@@ -167,11 +167,13 @@ public function beforeSave($object)
         foreach ($value['values'] as $mediaAttrCode => $attrData) {
             if (array_key_exists($attrData, $newImages)) {
                 $object->setData($mediaAttrCode, $newImages[$attrData]['new_file']);
-                $object->setData($mediaAttrCode . '_label', ($newImages[$attrData]['label'] === null || $newImages[$attrData]['label_use_default']) ? $newImages[$attrData]['label_default'] : $newImages[$attrData]['label']);
+                $label = $newImages[$attrData]['label'] === null || !empty($newImages[$attrData]['label_use_default']) ? $newImages[$attrData]['label_default'] : $newImages[$attrData]['label'];
+                $object->setData($mediaAttrCode . '_label', $label);
             }
 
             if (array_key_exists($attrData, $existImages)) {
-                $object->setData($mediaAttrCode . '_label', ($existImages[$attrData]['label'] === null || $existImages[$attrData]['label_use_default']) ? $existImages[$attrData]['label_default'] : $existImages[$attrData]['label']);
+                $label = $existImages[$attrData]['label'] === null || !empty($existImages[$attrData]['label_use_default']) ? $existImages[$attrData]['label_default'] : $existImages[$attrData]['label'];
+                $object->setData($mediaAttrCode . '_label', $label);
             }
         }
 

From 99c778a198642b9e4b6025d9dfe6ce7baf159b6f Mon Sep 17 00:00:00 2001
From: Sven Reichel <github-sr@hotmail.com>
Date: Mon, 2 Sep 2024 07:47:58 +0200
Subject: [PATCH 4/6] PhpStan fixes (#4146)

* Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)

* Rector: CQ - UnusedForeachValueToArrayKeysRector

See Rector\CodeQuality\Rector\Foreach_\UnusedForeachValueToArrayKeysRector

* fixes + phpstan

See fix at rector: https://github.com/rectorphp/rector-src/pull/6164

* Fixes some phpstan errors

* Revert "Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)"

This reverts commit 3d7eaf63f2211a9e1a8defe8c29e8f6da889ab2e.

* Update app/code/core/Mage/Tag/Model/Tag.php

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>

* Updated docblock

- have to keep array from parent method

---------

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>
---
 .../Mage/Cms/Model/Wysiwyg/Images/Storage.php |   2 +-
 app/code/core/Mage/Core/Block/Abstract.php    |   4 +-
 app/code/core/Mage/Core/Helper/String.php     |   2 +-
 app/code/core/Mage/Core/Model/Config.php      |   6 +-
 app/code/core/Mage/Core/Model/Store.php       |   4 +-
 app/code/core/Mage/Core/functions.php         |   6 +-
 .../core/Mage/Tag/Block/Customer/Tags.php     |   2 +-
 app/code/core/Mage/Tag/Block/Product/List.php |   2 +-
 .../core/Mage/Tag/Block/Product/Result.php    |   4 +-
 app/code/core/Mage/Tag/Model/Api.php          |   1 +
 app/code/core/Mage/Tag/Model/Api/V2.php       |   6 +-
 .../Tag/Model/Entity/Customer/Collection.php  |   1 +
 .../Model/Resource/Customer/Collection.php    |   1 +
 app/code/core/Mage/Tag/Model/Tag.php          |   1 +
 lib/Varien/Simplexml/Element.php              |   2 +-
 phpstan.dist.baseline.neon                    | 127 +-----------------
 16 files changed, 27 insertions(+), 144 deletions(-)

diff --git a/app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php b/app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php
index 94e143a9073c..8aa9f1998c37 100644
--- a/app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php
+++ b/app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php
@@ -28,7 +28,7 @@ class Mage_Cms_Model_Wysiwyg_Images_Storage extends Varien_Object
     /**
      * Config object
      *
-     * @var Mage_Core_Model_Config_Element|Varien_Simplexml_Element|false
+     * @var Mage_Core_Model_Config_Element
      */
     protected $_config;
 
diff --git a/app/code/core/Mage/Core/Block/Abstract.php b/app/code/core/Mage/Core/Block/Abstract.php
index f33b14a031e7..b052542446cf 100644
--- a/app/code/core/Mage/Core/Block/Abstract.php
+++ b/app/code/core/Mage/Core/Block/Abstract.php
@@ -993,7 +993,9 @@ protected function _getUrlModelClass()
      */
     protected function _getUrlModel()
     {
-        return Mage::getModel($this->_getUrlModelClass());
+        /** @var Mage_Core_Model_Url $model */
+        $model = Mage::getModel($this->_getUrlModelClass());
+        return $model;
     }
 
     /**
diff --git a/app/code/core/Mage/Core/Helper/String.php b/app/code/core/Mage/Core/Helper/String.php
index 49544a738561..02ab17ead366 100644
--- a/app/code/core/Mage/Core/Helper/String.php
+++ b/app/code/core/Mage/Core/Helper/String.php
@@ -466,7 +466,7 @@ protected function _getLastSubkey($key, $withBrackets = true)
     /**
      * Set array helper
      *
-     * @param Mage_Core_Helper_Abstract|Mage_Core_Helper_Array $helper
+     * @param Mage_Core_Helper_Array $helper
      * @return $this
      */
     public function setArrayHelper(Mage_Core_Helper_Abstract $helper)
diff --git a/app/code/core/Mage/Core/Model/Config.php b/app/code/core/Mage/Core/Model/Config.php
index b921c35fe428..546aa7bbef4b 100644
--- a/app/code/core/Mage/Core/Model/Config.php
+++ b/app/code/core/Mage/Core/Model/Config.php
@@ -724,7 +724,7 @@ protected function _getSectionConfig($path)
      * Get node value from cached section data
      *
      * @param array $path
-     * @return false|Varien_Simplexml_Element
+     * @return false|Mage_Core_Model_Config_Element
      */
     public function getSectionNode($path)
     {
@@ -741,7 +741,7 @@ public function getSectionNode($path)
      * Returns node found by the $path and scope info
      *
      * @inheritDoc
-     * @return Mage_Core_Model_Config_Element|Varien_Simplexml_Element|false
+     * @return Mage_Core_Model_Config_Element
      */
     public function getNode($path = null, $scope = '', $scopeCode = null)
     {
@@ -1150,7 +1150,7 @@ public function substDistroServerVars($data)
      * Get module config node
      *
      * @param string $moduleName
-     * @return Mage_Core_Model_Config_Element|SimpleXMLElement
+     * @return Mage_Core_Model_Config_Element
      */
     public function getModuleConfig($moduleName = '')
     {
diff --git a/app/code/core/Mage/Core/Model/Store.php b/app/code/core/Mage/Core/Model/Store.php
index 286db5850d06..981e8d1fe667 100644
--- a/app/code/core/Mage/Core/Model/Store.php
+++ b/app/code/core/Mage/Core/Model/Store.php
@@ -967,9 +967,9 @@ public function roundPrice($price)
     /**
      * Format price with currency filter (taking rate into consideration)
      *
-     * @param   double $price
+     * @param   float $price
      * @param   bool $includeContainer
-     * @return  string
+     * @return  string|float
      */
     public function formatPrice($price, $includeContainer = true)
     {
diff --git a/app/code/core/Mage/Core/functions.php b/app/code/core/Mage/Core/functions.php
index de853bee9c59..1e46c5d58143 100644
--- a/app/code/core/Mage/Core/functions.php
+++ b/app/code/core/Mage/Core/functions.php
@@ -103,7 +103,7 @@ function mageFindClassFile($class)
  * @param string $errstr
  * @param string $errfile
  * @param int $errline
- * @return bool|void
+ * @return bool|null
  */
 function mageCoreErrorHandler($errno, $errstr, $errfile, $errline)
 {
@@ -184,6 +184,7 @@ function mageCoreErrorHandler($errno, $errstr, $errfile, $errline)
         throw new Exception($errorMessage);
     } else {
         Mage::log($errorMessage, Zend_Log::ERR);
+        return null;
     }
 }
 
@@ -191,7 +192,7 @@ function mageCoreErrorHandler($errno, $errstr, $errfile, $errline)
  * @param bool $return
  * @param bool $html
  * @param bool $showFirst
- * @return string|void
+ * @return string|null
  *
  * @SuppressWarnings(PHPMD.ErrorControlOperator)
  */
@@ -216,6 +217,7 @@ function mageDebugBacktrace($return = false, $html = true, $showFirst = false)
         return $out;
     } else {
         echo $out;
+        return null;
     }
 }
 
diff --git a/app/code/core/Mage/Tag/Block/Customer/Tags.php b/app/code/core/Mage/Tag/Block/Customer/Tags.php
index 075c3960090b..01ce223e417d 100644
--- a/app/code/core/Mage/Tag/Block/Customer/Tags.php
+++ b/app/code/core/Mage/Tag/Block/Customer/Tags.php
@@ -31,7 +31,7 @@ protected function _loadTags()
             $this->_tags = [];
 
             $tags = Mage::getResourceModel('tag/tag_collection')
-                ->addPopularity(null, Mage::app()->getStore()->getId())
+                ->addPopularity()
                 ->setOrder('popularity', 'DESC')
                 ->addCustomerFilter(Mage::getSingleton('customer/session')->getCustomerId())
                 ->setActiveFilter()
diff --git a/app/code/core/Mage/Tag/Block/Product/List.php b/app/code/core/Mage/Tag/Block/Product/List.php
index fd71223d3c87..d69ee562fa10 100644
--- a/app/code/core/Mage/Tag/Block/Product/List.php
+++ b/app/code/core/Mage/Tag/Block/Product/List.php
@@ -83,7 +83,7 @@ protected function _getCollection()
     protected function _beforeToHtml()
     {
         if (!$this->getProductId()) {
-            return false;
+            return $this;
         }
 
         return parent::_beforeToHtml();
diff --git a/app/code/core/Mage/Tag/Block/Product/Result.php b/app/code/core/Mage/Tag/Block/Product/Result.php
index aeb8638ff495..bd5da0fb9273 100644
--- a/app/code/core/Mage/Tag/Block/Product/Result.php
+++ b/app/code/core/Mage/Tag/Block/Product/Result.php
@@ -24,7 +24,7 @@
 class Mage_Tag_Block_Product_Result extends Mage_Catalog_Block_Product_Abstract
 {
     /**
-     * @var Mage_Tag_Model_Resource_Tag_Collection|null
+     * @var Mage_Tag_Model_Resource_Product_Collection|null
      */
     protected $_productCollection;
 
@@ -81,7 +81,7 @@ public function getProductListHtml()
     }
 
     /**
-     * @return Mage_Tag_Model_Resource_Tag_Collection
+     * @return Mage_Tag_Model_Resource_Product_Collection
      * @throws Mage_Core_Model_Store_Exception
      */
     protected function _getProductCollection()
diff --git a/app/code/core/Mage/Tag/Model/Api.php b/app/code/core/Mage/Tag/Model/Api.php
index bb04b28c8429..bb8debcee0ef 100644
--- a/app/code/core/Mage/Tag/Model/Api.php
+++ b/app/code/core/Mage/Tag/Model/Api.php
@@ -95,6 +95,7 @@ public function info($tagId, $store)
      */
     public function add($data)
     {
+        $result = [];
         $data = $this->_prepareDataForAdd($data);
         /** @var Mage_Catalog_Model_Product $product */
         $product = Mage::getModel('catalog/product')->load($data['product_id']);
diff --git a/app/code/core/Mage/Tag/Model/Api/V2.php b/app/code/core/Mage/Tag/Model/Api/V2.php
index 92fa9b27c8e4..0684d77772a6 100644
--- a/app/code/core/Mage/Tag/Model/Api/V2.php
+++ b/app/code/core/Mage/Tag/Model/Api/V2.php
@@ -59,7 +59,7 @@ public function add($data)
      *
      * @param int $tagId
      * @param string|int $store
-     * @return object
+     * @return object|array
      */
     public function info($tagId, $store)
     {
@@ -74,7 +74,7 @@ public function info($tagId, $store)
     /**
      * Convert data from object to array before add
      *
-     * @param object $data
+     * @param array|object $data
      * @return array
      */
     protected function _prepareDataForAdd($data)
@@ -86,7 +86,7 @@ protected function _prepareDataForAdd($data)
     /**
      * Convert data from object to array before update
      *
-     * @param object $data
+     * @param array|object $data
      * @return array
      */
     protected function _prepareDataForUpdate($data)
diff --git a/app/code/core/Mage/Tag/Model/Entity/Customer/Collection.php b/app/code/core/Mage/Tag/Model/Entity/Customer/Collection.php
index f6fe3c7b8b6f..d358c9416119 100644
--- a/app/code/core/Mage/Tag/Model/Entity/Customer/Collection.php
+++ b/app/code/core/Mage/Tag/Model/Entity/Customer/Collection.php
@@ -22,6 +22,7 @@
 class Mage_Tag_Model_Entity_Customer_Collection extends Mage_Customer_Model_Entity_Customer_Collection
 {
     protected $_tagTable;
+
     protected $_tagRelTable;
 
     public function __construct()
diff --git a/app/code/core/Mage/Tag/Model/Resource/Customer/Collection.php b/app/code/core/Mage/Tag/Model/Resource/Customer/Collection.php
index d9b4dbf57708..167552ad0f20 100644
--- a/app/code/core/Mage/Tag/Model/Resource/Customer/Collection.php
+++ b/app/code/core/Mage/Tag/Model/Resource/Customer/Collection.php
@@ -268,6 +268,7 @@ public function getSelectCountSql()
     public function addProductName()
     {
         $productsId   = [];
+        $productsSku  = [];
         $productsData = [];
 
         foreach ($this->getItems() as $item) {
diff --git a/app/code/core/Mage/Tag/Model/Tag.php b/app/code/core/Mage/Tag/Model/Tag.php
index 0f20394cd4c3..1dc6ee88c3a6 100644
--- a/app/code/core/Mage/Tag/Model/Tag.php
+++ b/app/code/core/Mage/Tag/Model/Tag.php
@@ -366,6 +366,7 @@ public function saveRelation($productId, $customerId, $storeId)
             ->setActive(Mage_Tag_Model_Tag_Relation::STATUS_ACTIVE)
             ->setCreatedAt($relationModel->getResource()->formatDate(time()));
 
+        $result = '';
         $relationModelSaveNeed = false;
         switch ($this->getStatus()) {
             case $this->getApprovedStatus():
diff --git a/lib/Varien/Simplexml/Element.php b/lib/Varien/Simplexml/Element.php
index ee22aa78864b..e07d39e6b77e 100644
--- a/lib/Varien/Simplexml/Element.php
+++ b/lib/Varien/Simplexml/Element.php
@@ -128,7 +128,7 @@ public function addChild($name, $value=null, $namespace=null)
      * @todo    Do we need to make it xpath look-a-like?
      * @todo    Check if we still need all this and revert to plain XPath if this makes any sense
      * @todo    param string $path Subset of xpath. Example: "child/grand[@attrName='attrValue']/subGrand"
-     * @param   string $path Example: "child/grand@attrName=attrValue/subGrand" (to make it faster without regex)
+     * @param   array|string $path Example: "child/grand@attrName=attrValue/subGrand" (to make it faster without regex)
      * @return  Varien_Simplexml_Element|false
      */
     public function descend($path)
diff --git a/phpstan.dist.baseline.neon b/phpstan.dist.baseline.neon
index 58d3dfd945da..aff5acc1f798 100644
--- a/phpstan.dist.baseline.neon
+++ b/phpstan.dist.baseline.neon
@@ -480,16 +480,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Adminhtml/Model/Config/Data.php
 
-		-
-			message: "#^Method Mage_Adminhtml_Model_Config_Data\\:\\:getConfigRoot\\(\\) should return Mage_Core_Model_Config_Element but returns Varien_Simplexml_Element\\|false\\.$#"
-			count: 1
-			path: app/code/core/Mage/Adminhtml/Model/Config/Data.php
-
-		-
-			message: "#^Property Mage_Adminhtml_Model_Config_Data\\:\\:\\$_configRoot \\(Mage_Core_Model_Config_Element\\|null\\) does not accept Varien_Simplexml_Element\\|false\\.$#"
-			count: 1
-			path: app/code/core/Mage/Adminhtml/Model/Config/Data.php
-
 		-
 			message: "#^Method Mage_Eav_Model_Entity_Abstract\\:\\:load\\(\\) invoked with 1 parameter, 2\\-3 required\\.$#"
 			count: 1
@@ -565,11 +555,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Adminhtml/controllers/Customer/Wishlist/Product/Composite/WishlistController.php
 
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:getClassName\\(\\)\\.$#"
-			count: 1
-			path: app/code/core/Mage/Adminhtml/controllers/IndexController.php
-
 		-
 			message: "#^Variable \\$id in isset\\(\\) always exists and is not nullable\\.$#"
 			count: 1
@@ -2170,11 +2155,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Checkout/controllers/OnepageController.php
 
-		-
-			message: "#^Method Mage_Cms_Model_Wysiwyg_Images_Storage\\:\\:getConfig\\(\\) should return Mage_Core_Model_Config_Element but returns Varien_Simplexml_Element\\|false\\.$#"
-			count: 1
-			path: app/code/core/Mage/Cms/Model/Wysiwyg/Images/Storage.php
-
 		-
 			message: "#^Method Mage_Eav_Model_Entity_Attribute_Source_Interface\\:\\:getAllOptions\\(\\) invoked with 2 parameters, 0 required\\.$#"
 			count: 1
@@ -2185,11 +2165,6 @@ parameters:
 			count: 2
 			path: app/code/core/Mage/ConfigurableSwatches/Model/Resource/Catalog/Product/Type/Configurable/Product/Collection.php
 
-		-
-			message: "#^Method Mage_Core_Block_Abstract\\:\\:_getUrlModel\\(\\) should return Mage_Core_Model_Url but returns Mage_Core_Model_Abstract\\|false\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Block/Abstract.php
-
 		-
 			message: "#^Method Mage_Core_Block_Abstract\\:\\:getHelper\\(\\) should return \\$this\\(Mage_Core_Block_Abstract\\) but returns Mage_Core_Block_Abstract\\.$#"
 			count: 1
@@ -2210,11 +2185,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Controller/Front/Router.php
 
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:is\\(\\)\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Controller/Varien/Action.php
-
 		-
 			message: "#^Constructor of class Mage_Core_Controller_Varien_Action has an unused parameter \\$invokeArgs\\.$#"
 			count: 1
@@ -2285,11 +2255,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Helper/Abstract.php
 
-		-
-			message: "#^Property Mage_Core_Helper_String\\:\\:\\$_arrayHelper \\(Mage_Core_Helper_Array\\) does not accept Mage_Core_Helper_Abstract\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Helper/String.php
-
 		-
 			message: "#^Property Mage_Core_Model_Abstract\\:\\:\\$_cacheTag \\(string\\|true\\) does not accept default value of type false\\.$#"
 			count: 1
@@ -2330,28 +2295,13 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Model/Cache.php
 
-		-
-			message: "#^Call to an undefined method SimpleXMLElement\\:\\:getClassName\\(\\)\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Model/Config.php
-
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:getClassName\\(\\)\\.$#"
-			count: 2
-			path: app/code/core/Mage/Core/Model/Config.php
-
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:is\\(\\)\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Model/Config.php
-
 		-
 			message: "#^Method Mage_Core_Model_Config\\:\\:cleanCache\\(\\) should return \\$this\\(Mage_Core_Model_Config\\) but returns Mage_Core_Model_Config\\.$#"
 			count: 1
 			path: app/code/core/Mage/Core/Model/Config.php
 
 		-
-			message: "#^Method Mage_Core_Model_Config\\:\\:getNodeClassInstance\\(\\) should return bool but returns object\\.$#"
+			message: "#^Method Mage_Core_Model_Config\\:\\:getNode\\(\\) should return Mage_Core_Model_Config_Element but returns Varien_Simplexml_Element\\|false\\.$#"
 			count: 1
 			path: app/code/core/Mage/Core/Model/Config.php
 
@@ -2575,21 +2525,11 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Model/Resource/Iterator.php
 
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:getClassName\\(\\)\\.$#"
-			count: 2
-			path: app/code/core/Mage/Core/Model/Resource/Setup.php
-
 		-
 			message: "#^Property Mage_Core_Model_Resource_Setup\\:\\:\\$_conn \\(Varien_Db_Adapter_Pdo_Mysql\\) does not accept Varien_Db_Adapter_Interface\\|false\\.$#"
 			count: 1
 			path: app/code/core/Mage/Core/Model/Resource/Setup.php
 
-		-
-			message: "#^Property Mage_Core_Model_Resource_Setup\\:\\:\\$_moduleConfig \\(Mage_Core_Model_Config_Element\\) does not accept SimpleXMLElement\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Model/Resource/Setup.php
-
 		-
 			message: "#^Property Mage_Core_Model_Resource_Setup\\:\\:\\$_resourceConfig \\(Mage_Core_Model_Config_Element\\) does not accept SimpleXMLElement\\.$#"
 			count: 1
@@ -2625,11 +2565,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Model/Store.php
 
-		-
-			message: "#^Method Mage_Core_Model_Store\\:\\:formatPrice\\(\\) should return string but returns float\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/Model/Store.php
-
 		-
 			message: "#^PHPDoc type bool of property Mage_Core_Model_Store\\:\\:\\$_cacheTag is not covariant with PHPDoc type string\\|true of overridden property Mage_Core_Model_Abstract\\:\\:\\$_cacheTag\\.$#"
 			count: 1
@@ -2675,16 +2610,6 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Core/Model/Url/Rewrite/Request.php
 
-		-
-			message: "#^Function mageCoreErrorHandler\\(\\) never returns void so it can be removed from the return type\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/functions.php
-
-		-
-			message: "#^Function mageDebugBacktrace\\(\\) never returns void so it can be removed from the return type\\.$#"
-			count: 1
-			path: app/code/core/Mage/Core/functions.php
-
 		-
 			message: "#^Variable \\$arguments might not be defined\\.$#"
 			count: 1
@@ -4200,11 +4125,6 @@ parameters:
 			count: 3
 			path: app/code/core/Mage/Sales/Model/Quote/Address.php
 
-		-
-			message: "#^Call to an undefined method Varien_Simplexml_Element\\:\\:getClassName\\(\\)\\.$#"
-			count: 1
-			path: app/code/core/Mage/Sales/Model/Quote/Address/Total/Collector.php
-
 		-
 			message: "#^Return type \\(\\$this\\(Mage_Sales_Model_Quote_Address_Total_Discount\\)\\) of method Mage_Sales_Model_Quote_Address_Total_Discount\\:\\:fetch\\(\\) should be compatible with return type \\(array\\) of method Mage_Sales_Model_Quote_Address_Total_Abstract\\:\\:fetch\\(\\)$#"
 			count: 1
@@ -4490,56 +4410,11 @@ parameters:
 			count: 1
 			path: app/code/core/Mage/Sitemap/Model/Resource/Catalog/Abstract.php
 
-		-
-			message: "#^Method Mage_Tag_Model_Resource_Tag_Collection\\:\\:addPopularity\\(\\) invoked with 2 parameters, 0\\-1 required\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Block/Customer/Tags.php
-
-		-
-			message: "#^Method Mage_Tag_Block_Product_List\\:\\:_beforeToHtml\\(\\) should return \\$this\\(Mage_Tag_Block_Product_List\\) but returns false\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Block/Product/List.php
-
-		-
-			message: "#^Property Mage_Tag_Block_Product_Result\\:\\:\\$_productCollection \\(Mage_Tag_Model_Resource_Tag_Collection\\|null\\) does not accept Mage_Tag_Model_Resource_Product_Collection\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Block/Product/Result.php
-
-		-
-			message: "#^Variable \\$result might not be defined\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Api.php
-
-		-
-			message: "#^Parameter \\#1 \\$data \\(object\\) of method Mage_Tag_Model_Api_V2\\:\\:_prepareDataForAdd\\(\\) should be compatible with parameter \\$data \\(array\\) of method Mage_Tag_Model_Api\\:\\:_prepareDataForAdd\\(\\)$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Api/V2.php
-
-		-
-			message: "#^Parameter \\#1 \\$data \\(object\\) of method Mage_Tag_Model_Api_V2\\:\\:_prepareDataForUpdate\\(\\) should be compatible with parameter \\$data \\(array\\) of method Mage_Tag_Model_Api\\:\\:_prepareDataForUpdate\\(\\)$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Api/V2.php
-
-		-
-			message: "#^Return type \\(object\\) of method Mage_Tag_Model_Api_V2\\:\\:info\\(\\) should be compatible with return type \\(array\\) of method Mage_Tag_Model_Api\\:\\:info\\(\\)$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Api/V2.php
-
 		-
 			message: "#^Access to an undefined property Mage_Tag_Model_Entity_Customer_Collection\\:\\:\\$_read\\.$#"
 			count: 1
 			path: app/code/core/Mage/Tag/Model/Entity/Customer/Collection.php
 
-		-
-			message: "#^Variable \\$productsSku might not be defined\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Resource/Customer/Collection.php
-
-		-
-			message: "#^Variable \\$result might not be defined\\.$#"
-			count: 1
-			path: app/code/core/Mage/Tag/Model/Tag.php
-
 		-
 			message: "#^Call to an undefined method Mage_Tax_Block_Sales_Order_Tax\\:\\:addTotal\\(\\)\\.$#"
 			count: 7

From 2b368b25760e74c708ef26209dbc98976265e2b2 Mon Sep 17 00:00:00 2001
From: Sven Reichel <github-sr@hotmail.com>
Date: Mon, 2 Sep 2024 07:48:53 +0200
Subject: [PATCH 5/6] Removed last errors (#4164)

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>
---
 .github/workflows/phpcs.yml                                    | 2 +-
 app/code/core/Mage/Catalog/Helper/Image.php                    | 3 ++-
 app/code/core/Mage/Core/Block/Abstract.php                     | 2 +-
 app/code/core/Mage/Core/Block/Template/Facade.php              | 3 ++-
 .../core/Mage/Oauth/Model/Consumer/Validator/KeyLength.php     | 3 ++-
 5 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/phpcs.yml b/.github/workflows/phpcs.yml
index e078a040ebe3..420390adadc9 100644
--- a/.github/workflows/phpcs.yml
+++ b/.github/workflows/phpcs.yml
@@ -45,4 +45,4 @@ jobs:
 
       - name: PHPCodeSniffer
         run: php vendor/bin/phpcs -s --report=full --standard=${{ matrix.rules.path }}
-        continue-on-error: ${{ matrix.rules.path != '.phpcs.xml.dist' }}
+        continue-on-error: ${{ matrix.rules.path == '.phpcs.ecg.xml.dist' }}
diff --git a/app/code/core/Mage/Catalog/Helper/Image.php b/app/code/core/Mage/Catalog/Helper/Image.php
index 0809ccd6eac8..3939a00d2a67 100644
--- a/app/code/core/Mage/Catalog/Helper/Image.php
+++ b/app/code/core/Mage/Catalog/Helper/Image.php
@@ -266,9 +266,10 @@ public function constrainOnly($flag)
      */
     public function backgroundColor($colorRGB)
     {
+        $args = func_get_args();
         // assume that 3 params were given instead of array
         if (!is_array($colorRGB)) {
-            $colorRGB = func_get_args();
+            $colorRGB = $args;
         }
         $this->_getModel()->setBackgroundColor($colorRGB);
         return $this;
diff --git a/app/code/core/Mage/Core/Block/Abstract.php b/app/code/core/Mage/Core/Block/Abstract.php
index b052542446cf..a164fea34fc8 100644
--- a/app/code/core/Mage/Core/Block/Abstract.php
+++ b/app/code/core/Mage/Core/Block/Abstract.php
@@ -513,9 +513,9 @@ public function unsetChild($alias)
      */
     public function unsetCallChild($alias, $callback, $result, $params)
     {
+        $args = func_get_args();
         $child = $this->getChild($alias);
         if ($child) {
-            $args = func_get_args();
             $alias = array_shift($args);
             $callback = array_shift($args);
             $result = (string)array_shift($args);
diff --git a/app/code/core/Mage/Core/Block/Template/Facade.php b/app/code/core/Mage/Core/Block/Template/Facade.php
index 764f03903ca5..6437feb20132 100644
--- a/app/code/core/Mage/Core/Block/Template/Facade.php
+++ b/app/code/core/Mage/Core/Block/Template/Facade.php
@@ -61,8 +61,9 @@ public function setDataByKeyFromRegistry($key, $registryKey)
      */
     public function ifEquals($conditionKeys)
     {
+        $args = func_get_args();
         if (!is_array($conditionKeys)) {
-            $conditionKeys = func_get_args();
+            $conditionKeys = $args;
         }
 
         // evaluate conditions (equality)
diff --git a/app/code/core/Mage/Oauth/Model/Consumer/Validator/KeyLength.php b/app/code/core/Mage/Oauth/Model/Consumer/Validator/KeyLength.php
index 7a76430e5de2..ac4a2f9b13e5 100644
--- a/app/code/core/Mage/Oauth/Model/Consumer/Validator/KeyLength.php
+++ b/app/code/core/Mage/Oauth/Model/Consumer/Validator/KeyLength.php
@@ -35,8 +35,9 @@ class Mage_Oauth_Model_Consumer_Validator_KeyLength extends Zend_Validate_String
      */
     public function __construct($options = [])
     {
+        $args = func_get_args();
         if (!is_array($options)) {
-            $options     = func_get_args();
+            $options = $args;
             if (!isset($options[1])) {
                 $options[1] = 'utf-8';
             }

From 220399dcbc8a8f39e0e1fffb3f2d61f150fa6b31 Mon Sep 17 00:00:00 2001
From: Sven Reichel <github-sr@hotmail.com>
Date: Mon, 2 Sep 2024 07:49:24 +0200
Subject: [PATCH 6/6] Small DocBlock update (#4160)

* Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)

* Rector: CQ - UnusedForeachValueToArrayKeysRector

See Rector\CodeQuality\Rector\Foreach_\UnusedForeachValueToArrayKeysRector

* fixes + phpstan

See fix at rector: https://github.com/rectorphp/rector-src/pull/6164

* Revert "Rector: CQ - UnusedForeachValueToArrayKeysRector (#1)"

This reverts commit 3d7eaf63f2211a9e1a8defe8c29e8f6da889ab2e.

* DocBlock update

* Update app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>

* Update app/code/core/Mage/Core/Model/Session/Abstract.php

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>

* Update app/code/core/Mage/Core/Model/Session/Abstract.php

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>

---------

Co-authored-by: Ng Kiat Siong <kiatsiong.ng@gmail.com>
---
 app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php        | 2 +-
 .../Mage/CatalogSearch/Model/Resource/Search/Collection.php | 4 ++--
 app/code/core/Mage/Core/Model/Session/Abstract.php          | 4 ++--
 .../Newsletter/Model/Resource/Subscriber/Collection.php     | 2 +-
 .../Model/Resource/Report/Invoiced/Collection/Order.php     | 2 +-
 .../Mage/Sales/Model/Resource/Report/Order/Collection.php   | 2 +-
 .../Model/Resource/Report/Refunded/Collection/Order.php     | 2 +-
 .../Model/Resource/Report/Shipping/Collection/Order.php     | 2 +-
 .../Mage/SalesRule/Model/Resource/Report/Collection.php     | 2 +-
 app/code/core/Mage/Tax/Model/Resource/Report/Collection.php | 2 +-
 lib/Varien/Db/Adapter/Pdo/Mysql.php                         | 6 +++---
 11 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php b/app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php
index e8727e2b36fe..78451d7bcde5 100644
--- a/app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php
+++ b/app/code/core/Mage/Adminhtml/Helper/Help/Mapping.php
@@ -231,7 +231,7 @@ protected function findInMapping($frontModule, $controllerName, $actionName)
     /**
      * Determine which version of docs should target onto
      *
-     * @return string
+     * @return Mage_Core_Model_Config_Element|Varien_Simplexml_Element|false
      */
     protected function getHelpTargetVersion()
     {
diff --git a/app/code/core/Mage/CatalogSearch/Model/Resource/Search/Collection.php b/app/code/core/Mage/CatalogSearch/Model/Resource/Search/Collection.php
index 7862c441895f..c492cb21fcbd 100644
--- a/app/code/core/Mage/CatalogSearch/Model/Resource/Search/Collection.php
+++ b/app/code/core/Mage/CatalogSearch/Model/Resource/Search/Collection.php
@@ -105,7 +105,7 @@ protected function _hasAttributeOptionsAndSearchable($attribute)
      * Retrieve SQL for search entities
      *
      * @param string $query
-     * @return string
+     * @return Varien_Db_Select
      */
     protected function _getSearchEntityIdsSql($query)
     {
@@ -168,7 +168,7 @@ protected function _getSearchEntityIdsSql($query)
      * Retrieve SQL for search entities by option
      *
      * @param string $query
-     * @return false|string
+     * @return false|Varien_Db_Select
      */
     protected function _getSearchInOptionSql($query)
     {
diff --git a/app/code/core/Mage/Core/Model/Session/Abstract.php b/app/code/core/Mage/Core/Model/Session/Abstract.php
index c3b858d04c34..1e30dc2ddc07 100644
--- a/app/code/core/Mage/Core/Model/Session/Abstract.php
+++ b/app/code/core/Mage/Core/Model/Session/Abstract.php
@@ -524,7 +524,7 @@ public function getSessionHosts()
     /**
      * Retrieve session save method
      *
-     * @return string
+     * @return Mage_Core_Model_Config_Element|Varien_Simplexml_Element|false|string
      */
     public function getSessionSaveMethod()
     {
@@ -537,7 +537,7 @@ public function getSessionSaveMethod()
     /**
      * Get session save path
      *
-     * @return string
+     * @return Mage_Core_Model_Config_Element|Varien_Simplexml_Element|false|string
      */
     public function getSessionSavePath()
     {
diff --git a/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php b/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
index 511961f0a734..47f179644105 100644
--- a/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
+++ b/app/code/core/Mage/Newsletter/Model/Resource/Subscriber/Collection.php
@@ -173,7 +173,7 @@ public function showStoreInfo()
      * @deprecated after 1.4.0.0-rc1
      *
      * @param string $field
-     * @return string
+     * @return string|Zend_Db_Expr
      */
     public function _getFieldTableAlias($field)
     {
diff --git a/app/code/core/Mage/Sales/Model/Resource/Report/Invoiced/Collection/Order.php b/app/code/core/Mage/Sales/Model/Resource/Report/Invoiced/Collection/Order.php
index ee7b289e7586..9f9e8662e5ab 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Report/Invoiced/Collection/Order.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Report/Invoiced/Collection/Order.php
@@ -24,7 +24,7 @@ class Mage_Sales_Model_Resource_Report_Invoiced_Collection_Order extends Mage_Sa
     /**
      * Period format
      *
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/app/code/core/Mage/Sales/Model/Resource/Report/Order/Collection.php b/app/code/core/Mage/Sales/Model/Resource/Report/Order/Collection.php
index 4e49fec48cc1..6810a3b9029c 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Report/Order/Collection.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Report/Order/Collection.php
@@ -24,7 +24,7 @@ class Mage_Sales_Model_Resource_Report_Order_Collection extends Mage_Sales_Model
     /**
      * Period format
      *
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/app/code/core/Mage/Sales/Model/Resource/Report/Refunded/Collection/Order.php b/app/code/core/Mage/Sales/Model/Resource/Report/Refunded/Collection/Order.php
index 0e568ccf98b0..1872af34d95e 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Report/Refunded/Collection/Order.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Report/Refunded/Collection/Order.php
@@ -24,7 +24,7 @@ class Mage_Sales_Model_Resource_Report_Refunded_Collection_Order extends Mage_Sa
     /**
      * Period format
      *
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/app/code/core/Mage/Sales/Model/Resource/Report/Shipping/Collection/Order.php b/app/code/core/Mage/Sales/Model/Resource/Report/Shipping/Collection/Order.php
index 6f4108d72755..3054e6597b8e 100644
--- a/app/code/core/Mage/Sales/Model/Resource/Report/Shipping/Collection/Order.php
+++ b/app/code/core/Mage/Sales/Model/Resource/Report/Shipping/Collection/Order.php
@@ -24,7 +24,7 @@ class Mage_Sales_Model_Resource_Report_Shipping_Collection_Order extends Mage_Sa
     /**
      * Period format
      *
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/app/code/core/Mage/SalesRule/Model/Resource/Report/Collection.php b/app/code/core/Mage/SalesRule/Model/Resource/Report/Collection.php
index 354e7162f6bf..93ed63c9c28c 100644
--- a/app/code/core/Mage/SalesRule/Model/Resource/Report/Collection.php
+++ b/app/code/core/Mage/SalesRule/Model/Resource/Report/Collection.php
@@ -24,7 +24,7 @@ class Mage_SalesRule_Model_Resource_Report_Collection extends Mage_Sales_Model_R
     /**
      * Period format for report (day, month, year)
      *
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/app/code/core/Mage/Tax/Model/Resource/Report/Collection.php b/app/code/core/Mage/Tax/Model/Resource/Report/Collection.php
index 83364b3ca500..291994d8c6a5 100644
--- a/app/code/core/Mage/Tax/Model/Resource/Report/Collection.php
+++ b/app/code/core/Mage/Tax/Model/Resource/Report/Collection.php
@@ -22,7 +22,7 @@
 class Mage_Tax_Model_Resource_Report_Collection extends Mage_Sales_Model_Resource_Report_Collection_Abstract
 {
     /**
-     * @var string
+     * @var Zend_Db_Expr
      */
     protected $_periodFormat;
 
diff --git a/lib/Varien/Db/Adapter/Pdo/Mysql.php b/lib/Varien/Db/Adapter/Pdo/Mysql.php
index 6cde14f59cf0..1e8d20bafcae 100644
--- a/lib/Varien/Db/Adapter/Pdo/Mysql.php
+++ b/lib/Varien/Db/Adapter/Pdo/Mysql.php
@@ -277,7 +277,7 @@ public function getTransactionLevel()
      * Convert date to DB format
      *
      * @param   int|string|Zend_Date $date
-     * @return  string
+     * @return  Zend_Db_Expr
      */
     public function convertDate($date)
     {
@@ -288,11 +288,11 @@ public function convertDate($date)
      * Convert date and time to DB format
      *
      * @param   int|string|Zend_Date $datetime
-     * @return  string
+     * @return  Zend_Db_Expr
      */
     public function convertDateTime($datetime)
     {
-        return $this->formatDate($datetime, true);
+        return $this->formatDate($datetime);
     }
 
     /**